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This is cleaner overall since now each widget type no longer needs to
keep track of its own instances and updating of the GUI alpha. It also
introduces a single point from where the GUI theme support can be
enhanced.
Theme is no longer a singleton, though for now there is a single
instance owned by the Gui singleton.
Widgets adjusted to delegate their painting to the Theme:
* Button
* Tab
* TextField
* CheckBox
* RadioButton
* Slider
* DropDown
* ProgressBar
* ScrollArea
* ResizeGrip
* PlayerBox (by subclassing ScrollArea)
The Window and Popup widgets already use the theme through the Skin
class. They can actually use a different skin per instance, though this
feature is only used by the SpeechBubble.
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