Tooltips IDs can't go above 0xFFFF.
Remove unused variables after eb191c09cc96450a4e62c3592a5697b407f6bc36.
Remove some overzealous constifications to avoid C4510 and C4610 warnings.

The language resources array is const already so there is no risk of unwanted modification.
Add missing file in MPCTestAPI.vcxproj.filters.
Update Changelog.txt.
Be consistent with the var type.
madVR: Hook DXVA decoder to have status and logging.
Cosmetics: Use the IID_PPV_ARGS macro when possible (1/2).
Cosmetics: Use the IID_PPV_ARGS macro when possible (2/2).
Improve the reliability of the [DXVA] indicator in the status bar.

Sometimes the indicator wasn't shown while hardware acceleration was used.

This commit fixes #3518.
Get the DXVA status once and for all when opening the file.

No need to check it every time the status bar is updated.
Fix some typos.
Cosmetics: Consistently name the video renderer data variable.
Renderer statistics: Show the DXVA info from LAV when available.
Support for multiple programs in one IFO file.

WIP