Xcode 16, support pause/resume video

Checked with Xcode 16 with warnings fix.
Added support for pause/resume video by @asam139.

Xcode 14 support - better late than never.

2.8.0

iOS 15 and SPM support

• Move MulticastDelegate to a separate repository and use it as a dependency;
• Add SMP support;
• Tested with iOS 15;

Transparency support.

Now SCNRecorder supports both HEVC with Alpha codec and pixel formats with premultiplied alpha.

Small AudioEngine update.

2.5.1

Fixes and small additions.

1. Fix memory leak #23.
2. Fix freezes.
3. Add AudioEngine to play music and add to recording at the same time.

Performance and reliability.

• Use Metal Performance Shaders to copy and covert bytes.
  A most performant way regardless of iOS version and device model.

• Add integration tests.
  They cover the most important parts of SCNRecorder to guarantee reliability
  

• Update internal audio settings to support mp4, m4v, 3gp from any source.

• Cleanup.

Simpler. Faster.

• Drop OpenGL support.
• Fix first time recording frame drop.
• Move AWAssetWriter's initialization to a separate queue.
• Remove a bunch of any more not used files.
• Drop Filters support - with current implementation they produce wrong results, they should be redone if needed.
• Minor performance improvements.

Fix taking photo crash in 2.1.

2.1.3