* FFmpeg4 support. Compile warnings fixes. Credit goes to many people, including ferdnyc, peterM, and other awesome folks!
* Adding environment checking to enable/disable omp taskwait after each video/audio frame is processed. This is experimental for some users with crashes.
* Moving `omp taskwait` to after the ProcessVideoPacket() method, since that is the only place it is useful.
* Fixing crashes on missing Clip source file, and changing FFmpeg scaling algorthm from SWS_BILINEAR to SWS_LANCZOS (for higher quality scaling)
* Update FindFFmpeg.cmake module, and updating build script. Also enabling debug builds.
* Updating experimental travis build script
* Fixed unit test for newer version of FFmpeg (audio resampling)
* Experimental travis multiple jobs
* Adding OMP schedule hint (thanks PeterM), which prevents crashes in some circumstances.
* Adding strict experimental to FFmpegReader and Writer (hopefully allowing all the encoders to be used)
(cherry picked from commit 1bcd1e5)
* init all formats and codecs before checking if valid
(cherry picked from commit 7250226)
* Prevent a negative starting sample when adding audio to a frame
* Move critical sections to prevent crash on Windows
* Integrate custom libopenshot branches into GitLab build pipeline. Also, download previous artifacts from same branch name, and default to develop if not found.
* Adding conditional download of artifacts... use current branch name first, and then fallback to develop artifacts. This is to help the build pipeline support all branches.
* Re-adding master to gitlab pipeline
* Update Frame.cpp
Fixing merge error
* Update Version.h
Reverting version for develop branch
* Make python install target overridable via env variable
* Fixing audio unit tests
* Making linux builds automatic again
* Another attempt to collect python installed files as artifacts
* Changing python windows powershell syntax
* Testing new powershell syntax
* Make python install target overridable via env variable
* Fixing audio unit tests
* Making linux builds automatic again
* Another attempt to collect python installed files as artifacts
* Changing python windows powershell syntax
* Testing new powershell syntax
