uxtheme: theme data processing

[Kevin Koltzau]

This implements just enough at the moment to possibly trick some applications into
thinking theming is actually available, which could break them (mostly display issues
if the app ignores errors on theme drawing functions)
This will only be an issue if you have a theme installed and selected in your registry

Changelog:
    Full implementation of OpenThemeData, CloseThemeData, and IsThemePartDefined
    Export undocumented functions by ordinal only (to match Microsoft's uxtheme)
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