Merge pull request OpenShot#452 from OpenShot/release-20200229

Release branch for libopenshot 0.2.5 (SO 19)

Merge pull request OpenShot#407 from OpenShot/release-20200105

Release of libopenshot 0.2.4 (SO 18)

Merge pull request OpenShot#206 from OpenShot/release-20190320

Merge release branch into master

Merge pull request OpenShot#170 from OpenShot/release

Bumping version to 0.2.2 (SO: still 16)

Merge pull request OpenShot#165 from OpenShot/release

Releasing version to 0.2.1 (SO: 16)

Default to AAC audio codec (OpenShot#135)

* 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)

Bumping version to 0.1.9 (so 14)

Bumping version to 0.1.8 (SO version 13)

Bumping release to 0.1.7 (so version 12)

New release! Bumping version to 0.1.6