Adjust most audio driver settings dialogs

Adjust the dialogs of most audio driver settings dialogs by showing them
in a QGroupBox and adjusting their layouts. All dialogs now use
`QFormLayout` to layout their labels and input widgets.

Technical details
------------------
Introduce `AudioDeviceSetupGroupWidget` which is intended to
functionally replace `AudioDeviceSetupWidget` in the long run. This is
likely a temporary replacement in the sense that
`AudioDeviceSetupGroupWidget` will be renamed to
`AudioDeviceSetupWidget` once the latter has been replaced everywhere.
Both classes are very similar and the only difference is that the former
inherits from `QGroupBox` instead of `TabWidget`.

Adjust the using of AswMap so that it is now defined as a map from
`QString` to `AudioDeviceSetupGroupWidget`.

Use `QFormLayout` to layout the widgets of the setup dialogs instead of
hard coding geometries and placement.

TODOs
------
Adjust the widgets for the SoundIO and SndIo cases. These will be a bit
more effort as they are not compiled on my machine.

include/AudioAlsaSetupWidget.h

@@ -29,7 +29,7 @@
 
 #ifdef LMMS_HAVE_ALSA
 
-#include "AudioDeviceSetupWidget.h"
+#include "AudioDeviceSetupGroupWidget.h"
 
 #include "AudioAlsa.h"
 
@@ -41,7 +41,7 @@ namespace lmms::gui
 
 class LcdSpinBox;
 
-class AudioAlsaSetupWidget : public AudioDeviceSetupWidget
+class AudioAlsaSetupWidget : public AudioDeviceSetupGroupWidget
 {
 	Q_OBJECT
 

include/AudioDeviceSetupGroupWidget.h

@@ -0,0 +1,49 @@
+/*
+ * AudioDeviceSetupGroupWidget.h - Base class for audio device setup widgets using group box
+ *
+ * Copyright (c) 2004-2015 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ * Copyright (c) 2004-2015 Michael Gregorius
+ *
+ * This file is part of LMMS - https://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef LMMS_GUI_AUDIO_DEVICE_SETUP_GROUP_WIDGET_H
+#define LMMS_GUI_AUDIO_DEVICE_SETUP_GROUP_WIDGET_H
+
+#include <QGroupBox>
+
+namespace lmms::gui
+{
+
+class AudioDeviceSetupGroupWidget : public QGroupBox
+{
+    Q_OBJECT
+public:
+	AudioDeviceSetupGroupWidget( const QString & _caption, QWidget * _parent );
+
+	~AudioDeviceSetupGroupWidget() override = default;
+
+	virtual void saveSettings() = 0;
+
+	virtual void show();
+};
+
+} // namespace lmms::gui
+
+#endif // LMMS_GUI_AUDIO_DEVICE_SETUP_GROUP_WIDGET_H

include/AudioDummy.h

@@ -26,7 +26,7 @@
 #define LMMS_AUDIO_DUMMY_H
 
 #include "AudioDevice.h"
-#include "AudioDeviceSetupWidget.h"
+#include "AudioDeviceSetupGroupWidget.h"
 #include "AudioEngine.h"
 #include "MicroTimer.h"
 
@@ -54,11 +54,11 @@ public:
 	}
 
 
-	class setupWidget : public gui::AudioDeviceSetupWidget
+	class setupWidget : public gui::AudioDeviceSetupGroupWidget
 	{
 	public:
 		setupWidget( QWidget * _parent ) :
-			gui::AudioDeviceSetupWidget( AudioDummy::name(), _parent )
+			gui::AudioDeviceSetupGroupWidget( AudioDummy::name(), _parent )
 		{
 		}
 

include/AudioJack.h

@@ -38,7 +38,7 @@
 #include <QVector>
 
 #include "AudioDevice.h"
-#include "AudioDeviceSetupWidget.h"
+#include "AudioDeviceSetupGroupWidget.h"
 
 class QLineEdit;
 
@@ -74,7 +74,7 @@ public:
 	}
 
 
-class setupWidget : public gui::AudioDeviceSetupWidget
+class setupWidget : public gui::AudioDeviceSetupGroupWidget
 	{
 	public:
 		setupWidget( QWidget * _parent );

include/AudioOss.h

@@ -32,7 +32,7 @@
 #include <QThread>
 
 #include "AudioDevice.h"
-#include "AudioDeviceSetupWidget.h"
+#include "AudioDeviceSetupGroupWidget.h"
 
 class QLineEdit;
 
@@ -61,7 +61,7 @@ public:
 	static QString probeDevice();
 
 
-class setupWidget : public gui::AudioDeviceSetupWidget
+class setupWidget : public gui::AudioDeviceSetupGroupWidget
 	{
 	public:
 		setupWidget( QWidget * _parent );

include/AudioPortAudio.h

@@ -35,7 +35,7 @@
 #   include <portaudio.h>
 
 #   include "AudioDevice.h"
-#   include "AudioDeviceSetupWidget.h"
+#   include "AudioDeviceSetupGroupWidget.h"
 
 #   if defined paNeverDropInput || defined paNonInterleaved
 #	    define PORTAUDIO_V19
@@ -90,7 +90,7 @@ public:
 		unsigned long _framesPerBuffer );
 
 
-	class setupWidget : public gui::AudioDeviceSetupWidget
+	class setupWidget : public gui::AudioDeviceSetupGroupWidget
 	{
 	public:
 		setupWidget( QWidget * _parent );

include/AudioPulseAudio.h

@@ -34,7 +34,7 @@
 #include <QThread>
 
 #include "AudioDevice.h"
-#include "AudioDeviceSetupWidget.h"
+#include "AudioDeviceSetupGroupWidget.h"
 
 class QLineEdit;
 
@@ -62,7 +62,7 @@ public:
 	static QString probeDevice();
 
 
-	class setupWidget : public gui::AudioDeviceSetupWidget
+	class setupWidget : public gui::AudioDeviceSetupGroupWidget
 	{
 	public:
 		setupWidget( QWidget * _parent );

include/AudioSdl.h

@@ -37,7 +37,7 @@
 #endif
 
 #include "AudioDevice.h"
-#include "AudioDeviceSetupWidget.h"
+#include "AudioDeviceSetupGroupWidget.h"
 
 class QLineEdit;
 
@@ -57,7 +57,7 @@ public:
 	}
 
 
-	class setupWidget : public gui::AudioDeviceSetupWidget
+	class setupWidget : public gui::AudioDeviceSetupGroupWidget
 	{
 	public:
 		setupWidget( QWidget * _parent );

include/SetupDialog.h

@@ -29,7 +29,7 @@
 #include <QMap>
 
 #include "AudioDevice.h"
-#include "AudioDeviceSetupWidget.h"
+#include "AudioDeviceSetupGroupWidget.h"
 #include "lmmsconfig.h"
 #include "MidiClient.h"
 #include "MidiSetupWidget.h"
@@ -166,7 +166,7 @@ private:
 	bool m_vstAlwaysOnTop;
 	bool m_disableAutoQuit;
 
-	using AswMap = QMap<QString, AudioDeviceSetupWidget*>;
+	using AswMap = QMap<QString, AudioDeviceSetupGroupWidget*>;
 	using MswMap = QMap<QString, MidiSetupWidget*>;
 	using trMap = QMap<QString, QString>;