[[ ColorDialogColors ]] Reimplemented as a global property colorDialogColors Windows only. Added stubs for accessors on Linux.
Implemented in a way that the data type of customDialogColors could be different depending on the platform:
 - Windows - list of colors, could be changed to numerically indexed array if required
 - Mac - when Cocoa dialog is implemented could be multi-dimensional array with root key of list name, child keys numerically indexed, grandchind keys name and color
 - Lunux - not yet investigated