added support for debug messages from remote plugin

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1896 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/remote_plugin.h

@@ -483,6 +483,7 @@ enum RemoteMessageIDs
 	IdLoadSettingsFromString,
 	IdLoadSettingsFromFile,
 	IdLoadPresetFromFile,
+	IdDebugMessage,
 	IdUserBase = 64
 } ;
 
@@ -818,6 +819,11 @@ public:
 		return m_outputCount;
 	}
 
+	void debugMessage( const std::string & _s )
+	{
+		sendMessage( message( IdDebugMessage ).addString( _s ) );
+	}
+
 
 private:
 	void setShmKey( key_t _key, int _size );