added add_chunk_ticket

docs/scarpet/api/BlocksAndWorldAccess.md

@@ -712,3 +712,10 @@ It returns a `map` with a report indicating how many chunks were affected, and h
  * `layer_count_<status>`: number of chunks for which a `<status>` generation step has been performed
  * `layer_time_<status>`: cumulative time for all chunks spent on generating `<status>` step
  
+### add_chunk_ticket(pos, type, radius)
+
+Adds a chunk ticket at a position, which makes the game to keep the designated area centered around
+`pos` with radius of `radius` loaded for a predefined amount of ticks, defined by `type`. Allowed types
+are `portal`: 300 ticks, `teleport`: 5 ticks, and `unknown`: 1 tick. Radius can be from 1 to 32 ticks.
+
+This function is tentative - will likely change when chunk ticket API is properly fleshed out.

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

@@ -1,4 +1,5 @@
 air
+add_chunk_ticket
 biome
 blast_resistance
 block

docs/scarpet/resources/editors/npp/scarpet.xml

@@ -56,6 +56,7 @@
                 blocks_movement block_sound material map_colour property block_properties block_data poi set_poi
                 place_item set_biome biome loaded_status generation_status inhabited_time spawn_potential chunk_tickets
                 structure_eligibility structures structure_references set_structure reset_chunk reload_chunk
+                add_chunk_ticket
 
                 scoreboard scoreboard_add scoreboard_remove scoreboard_display