The constructor shouldn't be used as a dumping ground for all UI-related
initialization. Doing so makes it somewhat more difficult to reason about
how certain UI elements get created. It also puts unrelated identifiers in
the same scope.
This separates the UI creation out so code relevant to each component
is self-contained.
Hotkeys
Make a new class that inherits from InputConfigDialog with a specialised constructor. The changes are mainly the top portion and it now uses tabs to categorise the hotkeys.
Redo the GCPad configuration dialog
The layout is similar, but it now allows flexibility to change it more easily.
Redo the GC Keyboard configuration dialog
Same layout.
Redo completely the Wiimote configuration dialog
Separated the controls into 2 tabs to make them less imposing overall.
Redo the Nunchuk configuration dialog
Similar layout, except for 2 control group sizers.
Redo the Classic controller configuration dialog
Same layout.
Redo the Guitar input configuration dialog
Stacked 2 sets of group together.
Redo the Turntable configuration dialog
More stacked groups and the window is much less wide.
