Remove pause state key binding
Introduce convenience typedef for std::unique_ptr declarations
Introduce winning track on GameOverState and move sounds to GameObject
Change the start new game key binding to Enter (from 'r')
Change selectCard return type to void (from bool)
Bug fix on crash when no cards are selected
Introduce load method for CardView
Move audio listener object to GameObject
Use GameObject's instance of nom::Display
Introduce loading progress feature

  * We probably will not absolutely need this
after music track streaming is implemented...
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