FTL Removal

[derrod]

Description

Removes FTL output, services, etc.

Motivation and Context

Per https://github.com/obsproject/obs-studio/discussions/4021 removal is due soon™

This PR shall also serve as a reminder for any services that still rely on FTL support in OBS that they shouldn't.

How Has This Been Tested?

Still builds!

Types of changes

• Code cleanup (non-breaking change which makes code smaller or more readable)

Checklist:

• [x] My code has been run through clang-format.
• [x] I have read the contributing document.
• [x] My code is not on the master branch.
• [x] The code has been tested.
• [x] All commit messages are properly formatted and commits squashed where appropriate.
• [x] I have included updates to all appropriate documentation.

[tytan652]

Since the PR remove YouNow, you should remove obs-studio/plugins/rtmp-services/service-specific/younow.h and obs-studio/plugins/rtmp-services/service-specific/younow.c.

[derrod]

Since the PR remove YouNow, you should remove obs-studio/plugins/rtmp-services/service-specific/younow.h and obs-studio/plugins/rtmp-services/service-specific/younow.c.

Done.