Revert "Fix rare black screen issue with madvr"

This reverts commit 455619eadd8c157f977041bdbad4522c47166eb3.

Not reproducible with latest mpc-hc and madvr.
Add wrapper for dynamic winapi function loading
MainFrame: allow unelevated taskbar messages

Fixes #4181
Seekbar: don't rely on system font for metrics

Refs #3997