* Add types to game_versions, allow filtering by version type
- Fixes an issue with version numbers in the initial mod indexing
queue
- Modifies the /api/v1/categories/game_versions route to take an
optional query parameter `type` to filter the listed game versions
- Creating tags is now idempotent
- Creating game_versions now requires a JSON body that specifies
the version type
* Implement automatic indexing of new Minecraft versions
It's currently set to run every 6 hours and isn't configurable; we
could add config for it, but it doesn't seem likely to be rate
limited or have issues with frequency.
