update version to 3.5.0-cascade-RC3
Revert "update version to 3.5.0-cascade-RC3"

This reverts commit 2951a1f37ec5f1e6d239c824c94398942a3fedce.
Test suite grooming
- Fixed several asserts that would cause ClassCastExceptions
- For the latter, added a new Matcher
- Disabled debug code on the AST parser tests
- Statically imported Hamcrest matchers in tests