MFH: r530460 r530464 r530501

multimedia/obs-studio: Add the vlc plugin that wasn't enabled on FreeBSD for some reason

multimedia/obs-studio: Add missing header for depending projects to access the OBS Studio API

multimedia/obs-studio: Update 25.0.1 -> 25.0.3 (25.0.3 contains bugfixes)

Bug fixed: https://github.com/obsproject/obs-studio/issues/2627#issuecomment-608509154
25.0.1 crashed on microphone change.

Approved by: ports-secteam (joneum)