Client: toggle help screen by clicking question icon
Client: help: added movement explanation for o
Client: question: added hu movement with some style changes
Client: help: added movement of other piece types
Client: use mokume image as background for main menu
Client: replaced turn selection toggle button with default select option
Client: customize: change tip text depending on context
Client: prevent promotion dialog when capturing king
Client: polished help screen UI a bit
Client: fix: check if the selected piece can be put on board before setting tip text
Client: added background texture image
Client: enlarge selected piece instead of background color change or shake to indicate selection
Client: change background color to indicate last move
Client: set viewport for mobile phone