Use predefined Color objects
Add internal check for existing card within CardHand::addCard
Add additional restart game key binding
Remove unused empty method
Rename addCard, removeCard to push_back, erase
Bug fix on right mouse click action; disabling feature until completed

	* This (very!) incomplete feature resulted in a bug by not canceling
the active card & therefore messing up the info boxes & cursor position
Rename CardHand::pos to CardHand::at
Rename files card_hand, card_view to CardHand, CardView
Reflect recent public API changes in nomlib

	* See nomlib commit #973b6bd
Introduce debug feature for shuffling a full high-level player1 hand