Added AssignPanel.setEditable
CheckedField: setText now triggers doVisualValidityFeedback
Gui: Added squadTab
Added gui.tabs.SquadTab
GenericPanel: Additional panel rows now get [grow,fill]
TabController is now an abstract class instead of an interface.
CheckedField: visual feedback now only triggers when enabled+editable
SquadTab: Added fields
todo
NameRefPair: Removed redundant get/set
AssignPanel: Renamed setEditable -> setEnabled to reflect action
SquadTab: added setEnabledAll, clearAll
Merge branch 'NameRefPairRefactor'
Merge branch 'SquadTab'