Select: Removed padding from custom selectmenu. Inherit border radii.
Select: Multiple select count bubble always inherits its theme from the select button.
Collapsible: Theme inheritance.
Added collapsibles to test page.
Theme: First pass on simplifying theming.
Theme: Simplifying theme inheritance for body style elements.
Theme: Simplifying theme inheritance for bar styled elements.
Theme: Simplifying theme inheritance for count bubbles and slider track/switch.
Select: Fixed theme inheritance for custom select menu header.
Theme: Removed selectors that were no longer needed. Cleaned up comments.