Viewer: clean code and display correct error name (not Dpx)
GeneratorContext: major modifications
- support optional input clip
  * output is same as input for
	component, bitDepth and pixel aspect ratio
- set correct Rod (1 pixel of difference)
ColorCube: major modification
- display black out of cube
- switch plugin version to 2.0
minor in terry: indentation cleaning
Checkerboard: display cubes in function of display window
ColorWheel: indentation cleaning
Text: major modifications
- define plugin as a generator
- can burn text with input clip
- merge background color with input
Generators: update version
update version for correct support of input connection
using temporary directory for BitDepth test
clean python tests: using same import method
adding functionnal tests / doc generation for generators
Merge branch 'develop' of github.com:tuttleofx/TuttleOFX into develop

Conflicts:
	libraries/tuttle/pyTest/testInputBufferCallback.py
adding FFMpeg first use cases in fonctional tests
Merge branch 'develop' of github.com:tuttleofx/TuttleOFX into develop
FFMpeg: clean code for DEBUG message log macro