XML Docs + WrapIdentifiers Unit Test

[RFBomb]

XML Tags to clarify usage of Opening/Closing Identifiers

Unit Test for Compiler.WrapIdentifiers and ReplaceIdentifierUnlessEscaped (the latter was just renamed according to the method name)

Unit tests written to showcase issue talked about in #583

Note: These tests are currently PASSING, bbut I don't think they should be passing the escaped tests due to dropping the escape characters.