Added screen handler system (#888)

* Added screen handler value

* Added screen handler constructor and function to show to player

* Made inventory_* functions work with screen handlers

* Event callbacks and some refactoring

* Exception if screen has no inventory

* Fixed NPE

* Close screen when null

* Added screen_property

* UNKNOWN_SCREEN throwable

* Fix error when not specifying click callback

* Access to non-container screen handler slots via the inventory_* functions

* Change lectern page

* Added button event

* Added 'close' event and refactoring callback

* Beacon and Brewing screens

* Cartography table screen

* Crafting screen

* Enchantment screen

* Grindstone

* Loom

* Merchant

* Shulkerbox

* Smithing table

* Stonecutter

* Use strings as screen type instead of ScreenHandlerType

* Remove support for multiple players

* Combining create_screen and open_screen and refactoring

* Allow modifying cursor stack

* Cleanup

* Docs

* Added multiple screen examples

* Rename to screen

* Added smoker and blast furnace

* Serialize screen content

* Store host name instead of context

* Add button value special cases to docs

* Spelling and grammar fixes by @James103

* Optimize screen inventory access

* Use -1 for slot click outside the screen

* As boolean, ScreenValue equals isOpen

* Revert "Use -1 for slot click outside the screen"

This reverts commit 68c113e71bb653191cedf4cc356ab7705838dc25.

* Rework of callback function

* Improve screen functionality with drop_item

* Editor keywords

* Only check syncId

* slot_update event callback

* Screem typo

* Mistake

* toTag returns "null" NBT for  closed screen

* Use null for slot index of -999

Co-authored-by: replaceitem <replaceitem.mc@gmail.com>

docs/scarpet/resources/editors/idea/2.txt

@@ -15,11 +15,13 @@ blocks_movement
 bossbar
 brightness
 chunk_tickets
+close_screen
 convert_date
 crafting_remaining_item
 create_datapack
 create_explosion
 create_marker
+create_screen
 current_dimension
 day_time
 delete_file
@@ -100,6 +102,7 @@ scoreboard_add
 scoreboard_remove
 scoreboard_display
 scoreboard_property
+screen_property
 tag_matches
 team_add
 team_leave