Fix more warnings and do some small optimizations (#1356)

* Fix more warnings and do some small optimizations

* Fix more warnings in ValueConversions

* Clean up some decompiler names and fix an unnecessary transformation around commands

* Use (way) more compact data structure for slot map

* Minor tweaks
Such as map directly in the collector

* I hate vanilla javac
Revert map changes in latest commit

src/main/java/carpet/mixins/DistanceManager_spawnChunksMixin.java

@@ -28,13 +28,13 @@ public abstract class DistanceManager_spawnChunksMixin implements ChunkTicketMan
     {
         long pos = chunkPos.toLong();
         SortedArraySet<Ticket<?>> set = tickets.get(pos);
-        Ticket existingTicket = null;
+        Ticket<?> existingTicket = null;
         if (set != null)
         {
             Iterator<Ticket<?>> iter = set.iterator();
             while(iter.hasNext())
             {
-                Ticket ticket = iter.next();
+                Ticket<?> ticket = iter.next();
                 if (ticket.getType() == TicketType.START)
                 {
                     existingTicket = ticket;