New widget specifically for volume settings.
Replace previous implementation using 10 toggle buttons.
Enable indicator animation
Fix indicator ghosting when drag and releasing
Add scroll capability to volume
Volume now can be adjusted from 0 - 99 with the mouse or the scroll wheel
- renamed CAdventureMapButton to more expectable CButton
- merged CButtonBase into CButton
- created more generic class for clickable elements
- created more generic class for selectable elements
- renamed CHighlightableButton to CToggleButton
- renamed CHighlightableButtonsGrous to CToggleGroup
- minimized differences between API of all these classes
- removed all but one contructors in buttons, with same parameters across all classes