Add VideoCodec option

[natario1]

Let you choose the encoding format. Fixes #136

[codecov]

Codecov Report

Merging #174 into master will increase coverage by 0.3%.
The diff coverage is 76.6%.

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/otaliastudios/cameraview/Camera1.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...com/otaliastudios/cameraview/CameraController.java	29.2% <100%> (+1.1%)	29 <2> (+2)	⬆️
...main/java/com/otaliastudios/cameraview/Mapper.java	73.4% <60%> (-1.6%)	4 <3> (+3)
...tions/com/otaliastudios/cameraview/VideoCodec.java	78.5% <78.5%> (ø)	4 <4> (?)
.../java/com/otaliastudios/cameraview/CameraView.java	68.4% <85.7%> (+0.3%)	113 <2> (+3)	⬆️