Refactor test verification into galaxy-lib-compat module.
- Refactor a bunch class methods in ``test.base.twilltestcase`` into module functions in ``galaxy.tools.verify``.
- Move ``test.base.test_data`` to ``galaxy.tools.verify.test_data``.
- Move ``test.base.asserts`` to ``galaxy.tools.verify.asserts``.
Remove duplication in execution of these methods between composite and normal test outputs. This also entailed reworking the parsing of the composite test outputs to bring them inline with normal outputs. In addition to simplify removing duplication, this means many more tests can be made over composite outputs - such as md5 checks and test assertions. I've added a new framework test tool to verify this.