start adding dynamic parameters into ffmpegwriter #70
put video preset in a group #70
only add video parameters #70
Update README.md
Update README.md
get parameters in FFMpeg writer
adding missing parameters
changing method to get help for each parameter
set closed groups by default
issue #70
Merge branch 'develop' into dev_cmdlineColors
Merge branch 'develop' into dev_colorGradationValidation
Merge branch 'develop' of github.com:tuttleofx/TuttleOFX into develop
Merge branch 'develop' of github.com:tuttleofx/TuttleOFX into develop
Merge branch 'develop'

Conflicts:
	README.md
Merge branch 'develop'
Merge branch 'develop' of github.com:tuttleofx/TuttleOFX into develop
Merge branch 'develop' of github.com:tuttleofx/TuttleOFX into develop
start adding all parameters dynamically for FFmpegWriter
Merge branch 'develop' into dev_ffmpeg_options

Conflicts:
	plugins/image/io/FFMpeg/src/ffmpeg/VideoFFmpegWriter.cpp
	plugins/image/io/FFMpeg/src/ffmpeg/VideoFFmpegWriter.hpp
	plugins/image/io/FFMpeg/src/writer/FFMpegWriterPlugin.cpp
	plugins/image/io/FFMpeg/src/writer/FFMpegWriterPlugin.hpp
	plugins/image/io/FFMpeg/src/writer/FFMpegWriterPluginFactory.cpp
Merge branch 'develop' of github.com:tuttleofx/TuttleOFX into develop
Set default bitdepth value to float when exporting EXR in OIIO plugin #138
Zoom ans scale systems changed and sampler corrected when using zoom.
Add mouse motion events to move in picture and correct reshape function.