* Merge branch 'hdr' of https://github.com/wickerwaka/Main_MiSTer into feature-hdr
Merged in wickerwaka's old HDR branch and integrated the BT2020 and DCI P3 color space conversion matrices. Changed "hdr" option to be a selection of matrix instead of saturation option.
* Add HDR example to MiSTer ini
* Addition of HDMI color controls (brightness, contrast, saturation, hue, gain, offset) that can be tweaked via MiSTer.ini (examples in-file). These controls are used to construct a matrix for the HDMI chip's color space converter. Due to the nature of this change, HDMI limited and YCbCr options have been reworked and combined into the color matrix routine (hdmi_config_set_csc)
* Change cc_ prefix to video_, as per suggestion and inline with existing video options.
