Shaders: shaders moved from ini and registry to separate folder.
(MPC-BE 2296, 2297, 2309, 2342)
Revert "Shaders: shaders moved from ini and registry to separate folder."

This reverts commit 0e2e3b94584d32dd76a654869cd849757f305cc8.
"After Playback": Always give "Once" events a higher priority than "Always" events.

This commit fixes #3001.
Some testing on SetAlwaysOnTop. (not working)