GitLab

* Use cmake for third party

* Apply patch to libmad

* Update gitignore

* Update docker test image

* Add caching to binary build for more reliable build

* Apply same logic to unittest workflow

* Use env var for switching SoX build and default to not

* Update README

* Fix packaging/CI script

* Clean up extension build mechanism and extension location

* Add back the switch to depend on external sox

* Remove print

* Fix