Internal filters: Support WMV / ASF / DVR-MS splitting.

Refs #2655.
Disable internal WMV/ASF/DVR-MS splitting and WMV decoding by default.

Microsoft filters are generally more stable for those formats.

This commit fixes #3569 #3679 #3680.
Use conversion constructors to work-around confusing AStyle styling.
Use a bitcheck instead of casting (WIP).

Fixes CID #965944.