Act as a field in a HyperCard-like setting. Has both properties of a Rectangle, and exposes some proteries of the TextMorph it owns.

	just like textMorph
	append: contents contents: fit fontName:size: initialize lineCount

	card & stack	top
	couldHoldSeparateDataForEachInstance Answer whether this type of morph is inherently capable of holding separate data for each instance ('card data')
	currentDataValue Answer the current data value held by the receiver
	setNewContentsFrom: talk to my text
	variableDocks Answer a list of VariableDock objects for docking up my data with an instance held in my containing playfield

	just like textMorph	top
	append: add to my text
	contents talk to my text
	contents: talk to my text
	fit tell my text to recompute its looks
	fontName:size: talk to my text
	initialize set up the field
	lineCount how many lines in my text

	instance creation	top
	authoringPrototype Answer an instance of the receiver that can serve as a prototype for authoring
	exampleBackgroundField Answer a scrollable background field for a parts bin