Submerge 3.4.6

- Exporting now works on 10.10 Yosemite and 10.11 El Capitan again.

Submerge 3.4.5

- Support for HEVC (High Efficiency Video Coding or H.265) export compatible with iOS 11, tvOS 11 and macOS High Sierra.
- FFmpeg updated to the 3.3.3 "Hilbert" release.
- The exported file now has the subtitle language code as part of it's file extension. Like mymovie.eng.mov.
- Now supports WebVTT time codes in the 00.00.000 form.
- Various bug fixes and tweaks.

Submerge 3.4.4

- ProRes now supports 4K output up to 4096x2160 pixels.
- ProRes will now always pass through audio without conversion.
- Adjusting volume for mp4 and mov files now works again.
- Various bug fixes and tweaks.

Submerge 3.4.3

- Fixed a huge memory leak when rendering subtitles.
- Various bug fixes and tweaks.