Update upstream & fix some chunk related issues (#2177)

* Updated Upstream (Bukkit/CraftBukkit)

Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
45690fe9 SPIGOT-5047: Correct slot types for 1.14 inventories

CraftBukkit Changes:
4090d01f SPIGOT-5047: Correct slot types for 1.14 inventories
e8c08362 SPIGOT-5046: World#getLoadedChunks returning inaccessible cached chunks.
d445af3b SPIGOT-5067: Add item meta for 1.14 spawn eggs

* Bring Chunk load checks in-line with spigot

As of the last upstream merge spigot now checks ticket level status
when returning loaded chunks for a world from api. Now our checks
will respect that decision.

* Fix spawn ticket levels

Vanilla would keep the inner chunks of spawn available for ticking,
however my changes made all chunks non-ticking. Resolve by changing
ticket levels for spawn chunks inside the border to respect this
behavior.


* Make World#getChunkIfLoadedImmediately return only entity ticking chunks

Mojang appears to be using chunks with level > 33 (non-ticking chunks)
as cached chunks and not actually loaded chunks.

* Bring all loaded checks in line with spigot

Loaded chunks must be at least border  chunks, or level <= 33

Spigot-API-Patches/0142-Add-source-block-to-BlockPhysicsEvent.patch

@@ -1,4 +1,4 @@
-From 446dc35778696bae18421ca76dd286f4b5388bfe Mon Sep 17 00:00:00 2001
+From b0f398fcc65b5e54c6b3711c8e2b3f180791846d Mon Sep 17 00:00:00 2001
 From: Sotr <i@omc.hk>
 Date: Thu, 23 Aug 2018 16:14:25 +0800
 Subject: [PATCH] Add source block to BlockPhysicsEvent