changed visual layout of hand and battlefield cards
scrap now only happens when scrap button is clicked
lobby can now handle Invite messages
`PhrancisGame` now takes an `ECSGame` as input and constructs from that
fixed button clicking bug in InviteWindow
Added server commands to check invites and running games
Merge branch 'javafx' of github.com:Cardshifter/Cardshifter into client-server
Fixed irrelevant FindBugs warning for fields are initialized with @FXML
ChatMessage is now sent when client closes game window
Added chat messages when game is started and when invite is declined