BREAKING CHANGE: This removes the following deprecated shims from the runtime:
`replace_urls`, `replace_course_urls`, `replace_jump_to_id_urls`. XBlocks need
to use the `replace_urls` service instead.
Deprecates the following attributes from ModuleSystem:
* replace_urls
* replace_course_urls
* replace_jump_to_id_urls
A new ReplaceURLService is created as replacement with a unified replace_urls method