PPageAudioSwitcher: Don't keep refs to graph objects.

Fixes #3300.
Use the _countof macro instead of hardcoded numbers.
Update Changelog.
player.html: remove width completely.

It's handled in JS.
Enable per-monitor DPI-aware on Windows 8.1.

Fixes #3356.
temp
Use ZeroMemory on more places instead of {0,0}
Fix NULL handle passed as parameter.
Update VirtualDub to v1.10.1-test12.