Instances of MessageSend encapsulate message sends to objects. Arguments can be either predefined or supplied when the message send is performed. MessageSends are used to implement the #when:send:to: event system.

Use #value to perform a message send with its predefined arguments and #valueWithArguments: if additonal arguments have to supplied.

Structure:
receiver Object -- object receiving the message send
selector Symbol -- message selector
arguments Array -- bound arguments

	comparing
	= hash

	evaluating
	value valueWithArguments:

	printing
	printOn:

	tiles
	asTilesIn: asTilesIn:globalNames: stringFor:

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	arguments
	arguments:
	receiver
	receiver:
	selector
	selector:

	comparing	top
	= Answer whether the receiver and the argument represent the same object. If = is redefined in any subclass, consider also redefining the message hash.
	hash Answer a SmallInteger whose value is related to the receiver's identity. May be overridden, and should be overridden in any classes that define =

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	value
	valueWithArguments:

	printing	top
	printOn: Append to the argument, aStream, a sequence of characters that identifies the receiver.

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	asTilesIn: Construct SyntaxMorph tiles for me.
	asTilesIn:globalNames: Construct SyntaxMorph tiles for me. If makeSelfGlobal is true, name the receiver and use that name, else use 'self'. (Note that this smashes 'self' into the receiver, regardless of what it was.)
	stringFor: Return a string suitable for compiling. Literal or reference from global ref dictionary. self is always named via the ref dictionary.

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	receiver:selector:
	receiver:selector:argument:
	receiver:selector:arguments: