`EntityTag.equipment_drop_chance` property (#2614)
* Initial commit.
* Update EntityEquipmentDropChance.java
* Update meta
* Fixed meta, removed checks, added mob check
* Remove unneeded check
* Java naming stuff, remove unneeded check, changed meta
* Updated key names
* Update property key names too
* Update names (again)
* Updated meta
* Added maptag explanation & tag example
(
commit: 2131db7)
