WordGamePanelMorph provides some default support for clicking and typing in a panel with letterMorphs.

letterMorphs a collection of LetterMorphs
Useful in referring specifically to active letterMorphs
when submorphs may contain other morphs

haveTypedHere a Boolean used to determine how backspace should be handled

	defaults
	clearTyping highlight: isClean keyCharacter:atIndex:nextFocus: lostFocus unhighlight

	events
	checkForLostFocus handlesMouseDown: keyStrokeEvent:letterMorph: mouseDownEvent:letterMorph:

	menu
	addCustomMenuItems:hand: addMenuItemsTo:hand:

	access	top
	letterMorphs

	defaults	top
	clearTyping Clear out all letters entered as a solution.
	highlight:
	isClean Return true only if all cells are blank.
	keyCharacter:atIndex:nextFocus: Override with actual response
	lostFocus
	unhighlight

	events	top
	checkForLostFocus Determine if the user has clicked outside this panel
	handlesMouseDown: Absorb mouseDown so stray clicks will not pick up the panel
	keyStrokeEvent:letterMorph: Handle typing. Calls keyCharacter:atIndex:nextFocus: for further behavior.
	mouseDownEvent:letterMorph:

	menu	top
	addCustomMenuItems:hand: Include our modest command set in the ctrl-menu
	addMenuItemsTo:hand: override with actual menu items

	as yet unclassified	top
	includeInNewMorphMenu Return true for all classes that can be instantiated from the menu