Extend LedCheckBox so that it adds support to render the text with the
default font in the default size. The class now supports two modes:
* Legacy mode
* Non-legacy mode
Legacy mode is the default and renders the LedCheckBox as before. The
font is set to 7 pixels and all the text is rendered with a shadow.
Non-legacy mode uses the current font to render the text. The text is
rendered without a shadow and the pixmap is centered vertically to the
left side of the text.
The non-legacy mode is currently only used in the context of the matrix
LADSPA dialog. Toggle options are rendered using it as well as the "Link
Channels" button.
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