Stop making case_type-related dirs for CaseStore
Move mergers specs to correct location
Competition enforcement case list

* Slightly rubbish, lots of duplication, tests pass, expect de-duping
Move common Case functions out into base class CMA::Case
Bad naming fix
Move OFT-specific constants to cma/oft
Make CaseStore aware of what it's loading
Fix require issue causing crawl fail
Competition crawler. Nav-only. Lots of duplication

* Expect a de-duping / base OFT crawler class soon
Add summaries to CMA::OFT::Competition::Case
Dedupe crawlers by adding an OFT::Crawler base

* Also, fix the specs I broke when adding CaseStore's load_class. No CI FTW!
Add formatted detail to Competition cases
Add missing mappings for competition and ITV
Assign criminal-cartels for the two criminal cases