VMR-9 (renderless)/EVR renderers: Improve device reset.

- Fix the display mode flickering when auto-changing the monitor mode.
- Fix auto-changing the monitor mode when starting in D3D fullscreen with "play 0 time" option or the auto-change delay greater than 0s.
- Fix a possible deadlock when starting in D3D fullscreen and "play 0 time" was used.

Fixes #4213.
Don't force any background color for the Shockwave graph.

This commit fixes #1747.
ISR: Render text subtitles relative to the video frame when in doubt.
Why "C:\tmp.srt"?
WebUI: Inform the web interface that no audio stream is available.
WebUI: Make use of new [hasaudio] info.
What the hell was intended here?!

Trying to make some sense of that code. Without much luck so far...
Fix: x86 and x64 versions conflicted over file associations.

4f465cf8b81f1da800b1bfc57cc48e317d24fbb5 was incomplete for Vista+.

This commit fixes #4064.
Auto mode for relative to.
Cosmetics: Use better IDs from the resource strings.