Adding lock around SetCache method, which causes some crashes. Detect…

…ed in Sentry: OPENSHOT-1Q

Removing debug code

Bumping version to 0.3.0, SO 23, and minimum libopenshot-audio depend…

…ency to 0.3.0.

Merge branch 'release-20210904' of github.com:OpenShot/libopenshot in…

…to release-20210904

Update Version to 0.2.6 SO 20

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)