Fix: External audio was not synced on open if restarting from the latest remembered position.

This commit fixes #3702.
Pin info: Fix misdetection of S/PDIF bitstreaming as PCM.
Internal filters: Support WMV splitting, enabled by default
Update LAV Filters ... (WIP)
Use conversion constructors to work-around confusing AStyle styling.
Use a bitcheck instead of casting (WIP).

Fixes CID #965944.