fixed bug that after killing a card it was not possible to place another card on that tile
added cards for kings

refactored some properties into other classes for better encapsulation
added settings for rows and columns
improved crown images to fit better into the tiles
improved placement of attack and health indication in tiles
fixed win condition to check for player's king card health
added style for ListBox to remove border around it
added cards: BarbarianPriest, BarbarianWarlord, Basilisk and Bat
refactored ImageSource so it's not necessary for cards to supply the full path
changed EndTurn button to have bigger font and some margin
fixed missing PropertyChanged for Player's remaining life
replaced resource cost in CardControl with diamond image
replaced attack and health indication in CardControl with images