Changes

build for 1.15.2
 (commit: a4e39fa)

implement action_bar deprecation, clean up 'actionbar' command a bit
 (commit: a8c0c3f)

required fixes for compat with new core update
 (commit: 2884cb3)

fix fishes event determination
 (commit: a5e0916)

fix missing determine for clicks-in-inventory event
 (commit: 18fb805)

Add catch for null chat packet, for #2129
 (commit: 9089ff1)

remove historical debug filter system
 (commit: 971e7c5)

aggressive package relocation to fix Spigot scaring users

Introducing a code error to hide a stupid warning that Spigot added (:
 (commit: 21093fb)

Fix some legacy style code/comments
 (commit: ba51291)

fix chat script event with alt bukkit priorities
 (commit: 0b0a9b6)

add LocationTag.round* tags
 (commit: 4084fef)

add player/npc tag.skull_skin
 (commit: a9f08af)

fix CuboidTag's losing their invalid-world-name data
 (commit: 08a41e4)

properly apply digit count to economy script format

this is hacky and I hate it but meh
 (commit: 8d5e98e)

improve click tags metas
 (commit: 2b0974c)

fix shoot command typo
 (commit: 178f64a)

fix lingering splash event, fixes #2136
 (commit: 1a1779f)

add tag/mech pair Location.lectern_page, for #2135
 (commit: 8b87aad)

fix Location.skull_skin mech, fixes #2138
 (commit: f3af565)