running changelog may 2018

o8g schema: game documents icon attribute now optional (was required).
game def: game document icons work again.
o8g schema: game font src now optional (was required).
game def: octgn will use its default font if no font src is defined.
o8build: validates that all sets have a gameId that matches the game's GUID
o8g schema: removed height attribute from group element
o8g schema: removed width attribute from group element
o8g schema: removed height attribute from hand element
o8g schema: removed width attribute from hand element
game def: added 'changetwosidedtable' attribute to game element. Boolean; Allows the host to change the two-sided table property (default True)
octgn: Load a Preset Deck option added to play window menu; Loads bundled decks directly from the game definition's install folder.
octgn: Installing a game won't copy all its decks into OCTGN's default Decks folder
python: Fixed a bug with fetching a card's property value, especially when it's from an alternate or overwritten property value
o8g schema: font size attribute now optional (uses OCTGN defaults if not specified)
o8build: validates that defined font sizes are greater than 0
python: fixed some bugs with switchTo() not showing the proper alternate after moving to a group then calling switchTo()
python: fixed some logic path issues and event triggers involving switching active player, current turn, and phases