Convert - Patch writer (#1352)

* Add cli-args and config opts for patch writer
* Add supporting code to convert funcs
* writers
  - move frame count functions to _base
  - Add kwargs for pre_encode
* scripts/lib convert - add code for patch writer
* lib.image.encode_image - Add cv2.imencode args
* patch_defaults: Add face index location option
* Add patch writer with PNG support
* Send correct matrix to patch plugin
* Add canvas origin option
* Add Tiff format to Patch Writer
* Docs and locales
* Add ROI to output
* convert: choose warp border by face count