1.5.0

merged v1.5.0 from visor-android (https://play.google.com/store/apps/details?id=de.visorapp.visor)
- now using a native module to calculate YUV -> RGB bytes
- do not a scale a bitmap by creating a new one, just use a Matrix and Canvas.
- added some sounds and animations
changed app-id (to have both apps installed at the same time)
changed app name to "Visor OS"
updated gradle, android plugin (using android studio canary)

still many things to do, especially refactoring!

upcoming: hide control buttons with a gesture and may be a digital zoom

v1.3

Added official apk-releases to repo

v1.1: restrict num of threads in background for bitmap processing to 1.

code cleaned, removed some methods.
made color filter assignment more dynamic. You can now give VisorSurface a List of ColorFilters and it will go through the list each time the Contrast-Button gets pressed.

v1.0

Merge branch 'feature_custom_color_modes'