Key features:
* No virtual functions
* Minimal memory footprint
* Ability to copy array/vector of colors with memcpy, memmove and initialize
  with memset.
* Conversions from/to different models ( and its formats ).
* Headers only
     One file to include to start the fun
     By using del or rm it is reducible in to only two of them.
* No third parties
* No additional binaries
* Out of the box ready
     No need to recompile or start some install process.
* Color models:
  * GRAY,
  * RGB, CMY, CMYK,
  * HSI, HSL, HSV, HWB,
  * YIQ, YUV(BT.601, BT.709), YCgCo, YPbPr(BT.601, BT.709, BT.2020),
  * XYZ(sRGB, D65, 2deg), LAB( CIE, Hunter), LUV, LMS (von Kries D65,
    von Kries E, BFD, MCAT02), xyY, LabCH, LuvCH