start adding dynamic parameters into ffmpegwriter #70
put video preset in a group #70
only add video parameters #70
get parameters in FFMpeg writer
adding missing parameters
changing method to get help for each parameter
set closed groups by default
issue #70
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
FFMpeg adding dynamic options
adding video and audio parameters:
- boolean
- choice (with default value)
- string
- int, double, float
- rational
- image size
issue #70
adding specific parameters for all codecs and formats
issue #70
Merge branch 'develop' into dev_ffmpeg_options
adding codec specific parameters
FFMmpeg: display specific parameters only for the selected codec - format
issue #70
disable tabulation for boolean group parameters
issue #70
FFMpeg: throw exception on error, not print a simple message
issue #70
FFMpeg: clean dynamic refresh on codec changes
issue #70
FFmpeg: starting to connect parameter to encoder
issue #70
FFMpeg: adding Pixel Format choice
Adding selector to choice bit depth used in the encoder.
Default Yuv420 is not sufficient on some codecs.
issue #70
FFMpegWriter: clean some bug fix with dynamic options
issue #70
FFmpegwriter: Fix optionSet for codec-specific options
Merge pull request #163 from shahriman/dev_ffmpeg_options

FFmpegwriter: Fix optionSet for codec-specific options
FFMpeg writer: clean set parameters and build for gcc
- correction to set format options
- adding a function to set a flag
- remove iteration on Enum type (using now an int type)
issue #70