Bring _HELPERS/_lists.dm to latest standards by:
-Adding proper documentation and fixing existing one
-Giving vars proper names
-Procs now use snake case as per standard (many files that use those procs will be affected)
* Move the preloader datum to its own file
* Prettify some of the map loader docs
* Use src rather than usr in map template verbs
* Cache parsed templates between upload and first use
* Validate map templates uploaded by admins before use
* Add href token to validation report links
