[ftinspect] Re-organize custom widgets.
As discussed in the E-Mail.
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src/ftinspect/maingui.hpp: Switch from individual widget files to the newly merged one.
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src/ftinspect/widgets/custom_widgets.{cpp, hpp}: All 4 custom widgets.
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src/ftinspect/widgets/qcomboboxx.{cpp, hpp}: Merged into custom_widgets.
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src/ftinspect/widgets/qgraphicsviewx.{cpp, hpp}: Merged into custom_widgets.
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src/ftinspect/widgets/qpushbottonx.{cpp, hpp}: Merged into custom_widgets.
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src/ftinspect/widgets/qspinbox.{cpp, hpp}: Merged into custom_widgets.
Those widgets could be considered "auxiliary components", and are pretty far from the core logic. Therefore, they should be made less "loud" (it's 8 source files out of 23 in total - more than 1/3 !).
Well... How should I write the commit message for this then?