* [feature] Add emoji categories GET
Serialize emojis in appropriate categories; make it possible to get categories via the admin API
* [feature] Create (or use existing) category for new emoji uploads
* fix lint issue
* update misleading line in swagger docs
* add admin emojis get path + model + docs
* stub admin emojis get processor function
* add id + disabled fields to admin emoji
* add emoji -> api admin emoji converter
* tidy up a bit
* add GetEmojis function
* finish up get emojis function
* order by shortcodedomain
* ASC
* tidy up + explain
* update to allow paging
* make admin emojis pageable
* fix mixed case paging
* normalize emoji queries a bit better
* test emoji get paging
* make limit optional
* fix incorrect path in media cleanup tests
* i have bad coder syndrome
* don't trimspace
* rename -> GetUseableEmojis
* wrap emoji query in subquery
avoid selecting more than we need
* fix a bit of sillyness teehee
* fix subquery postgres woes
tobi