Using `raise` on a delegate should generate an error message

[Chuck]

raise is for events only. In the error message, guide the user to the correct syntax for delegates.

Check ignore as well.

Currently, the compile throws an internal exception. Code:

class Test

	sig SimpleMethod

	def foo(s as SimpleMethod)
		raise s

	def main is shared
		pass

[hopscc]

Change assertion to check and emit error messages. Add additional hint if purported event is a methodSig/delegate. Additional error message testfile.

[Chuck]

Applied in changeset:1827

Thanks.