Re-Implement //regen (#598)

* start reimplementing regen command

* start reimplementing regen command

* Formatting and logic tweaks.

Regen will now throw exceptions but they are not caught yet.
ConversionSessions will now be closed when no longer being used instead of left open.

* fix //regen crashing server

* added //regen support for 1.16.1 and 1.15.2

* cleanup

* Update the issue template

* improve performance of regen by a factor of 40, approx 1.2 millon blocks/second

* Update the issue template

* Update the issue template & add a config (#640)

* Update the issue template

* Add a config.yml to the issue template

* improve performance of regen by a factor of 40, approx 1.2 millon blocks/second

* Fix entity rotation (#642)

* fix entity rotation
fixes #577 
Co-authored-by: wea_ondara <wea_ondara@alpenblock.net>

* Fix toggle permission (#644)

* Fixes #529
* fix superperms perm toggling

Co-authored-by: @weaondara <wea_ondara@alpenblock.net>

* Fix #647

* Squash errors and debug to aid fixing #652 properly

* cleanup imports

* cleanup imports 2

* cleanup imports 3

* cleanup imports 4

* add patch by @SirYwell

* aysnc world gen with features and stuff and some minor issues

* optimizations, full chunkstatus, block populators

* optimizations, cleanup

* optimizations

* fix feature regeneration, fix temp folder deletion

* cleanup

* make chunk gen multithreaded

* fix precomputation of chunk lists for RegionLimitedWorldAccess again

* added regenerator abstraction, fix aioobe while running through chunk stati

* remove override for getChunkAt in freshnmsworld

* don't use concurrent chunk gen if custom chunk generators do not support it

* distinct between generator types

* improve regen speed for overworlds

* mix

* Add message that regen might take a while

* use a shared map for FastAreaLazy, cleanup imports

* use custom concurrency levels for chunk stati and process accordingly

* implement new regen in 1.15.2 and 1.16.1 as well

Conflicts:
	worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java
	worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R1.java

* woops

* further abstraction, finalized regen impl

* Formatting

* Fix some typos, remove debug

* replace wildcard imports

* cleanup debug

* braces

* serr -> logger

* move regen impls to seperate classes

* fix world init for 1.16.1

* fix world init for 1.15.2

* fix world init for 1.15.2 #2

* use original world name for regeneration

* Update Regen_v1_15_R2.java

* Update worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java

Co-authored-by: Matt <4009945+MattBDev@users.noreply.github.com>

* Update worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java

Co-authored-by: Matt <4009945+MattBDev@users.noreply.github.com>

* Update worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R1.java

Co-authored-by: Matt <4009945+MattBDev@users.noreply.github.com>

* improve documentation, use parallel task count for fawe settings

* fix compile

Co-authored-by: wea_ondara <wea_ondara@alpenblock.net>
Co-authored-by: MattBDev <4009945+MattBDev@users.noreply.github.com>
Co-authored-by: dordsor21 <dordsor21@gmail.com>

worldedit-core/src/main/resources/lang/strings.json

@@ -165,6 +165,8 @@
 	"fawe.tips.tip.biome.pattern": "Tip: The #biome[forest] pattern can be used in any command",
 	"fawe.tips.tip.biome.mask": "Tip: Restrict to a biome with the `$jungle` mask",
 
+    "fawe.regen.time": "Regenerating region, this might take a while!",
+
     "worldedit.expand.description.vert": "Vertically expand the selection to world limits.",
     "worldedit.expand.expanded": "Region expanded {0} blocks",
     "worldedit.expand.expanded.vert": "Region expanded {0} blocks (top-to-bottom).",