[Added] loot groups can now contain other loot groups
[Added] unit test to check for infinite recursion in loot groups
[Added] unit test to check if a loot item has the same name as a loot
group

Change-Id: I9789a37673fe7cda05cd91df19f127bfe61d38ba
[Fixed] a few loot item/group file names so that the file name matches
the name of the template it adds
[Added] console warnings during loading when a loot item/group filename
doesn't match the name of the template it adds

Change-Id: Ibac51f43060c3f6108a8e2b0deea583e0438e0d4
Merge changes Ibac51f43,I9789a376 into unstable

* changes:
  [Fixed] a few loot item/group file names so that the file name matches the name of the template it adds [Added] console warnings during loading when a loot item/group filename doesn't match the name of the template it adds
  [Added] loot groups can now contain other loot groups [Added] unit test to check for infinite recursion in loot groups [Added] unit test to check if a loot item has the same name as a loot group