Added some benchmarking to the example.
Move widget drawing to its own source and header file.
Rework draw priority to correctly handle custom draw priority widgets in windows.
Always draw windows that aren't docked above windows that are.
Update list item hover when scrolling via the mouse wheel.
Fixed widget hover calculation bug where widget ancestor draw priority wasn't taken into account.
Fixed widget drawing bug where widget ancestor draw priority wasn't taken into account.
Fixed scroller nub not drawing sometimes.
Split wz_internal.h into separate headers.