test/rfc4475: add more tests for 3.1.1.1. A Short Tortuous INVITE
test/rfc4475: add failing test for escaped characters within quotes
src/grammar.pegjs: pass test for escaped characters within quotes
test/rfc4475: add test for 3.1.1.6. (No LWS between Display Name and <)
test/rfc4475: add tests for 3.1.1.7. Long Values in Header Fields
test/rfc4475: add tests for 3.1.1.10. Varied and Unknown Transport Types
test/rfc4475: add failing test for 3.1.1.11.  Multipart MIME Message
test/rfc4475: pass test for 3.1.1.11.  Multipart MIME Message
test/rfc4475: move `repeats` function to `repeat`, at top of file
test/rfc4475: add test for 3.1.1.12. Unusual Reason Phrase
dedupe SIP_message parsing, handle malformed start-lines
test/rfc4475: 3.3.2/3.3.3 - test for scheme types, not 4xx responses

The application that is using the parser can generate 4xx responses.