Updated German translation.
Fix handling of aspect ratio changes when using EVR-CP or Sync Renderer with DXVA.

Fixes #993 #2109 #2955.
Cosmetic: EVR-CP/Sync Renderer: Simplify the aspect-ratio reduction.
Updated Romanian translation (ticket #2050).
Cosmetic: EVR-CP/Sync Render: Remove unused variables.

Thanks to Snowknight26.
Remove D2VSource.  It's unmaintained and basically unused.