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/commands/MobAICommand.java

@@ -35,7 +35,7 @@ public class MobAICommand
                                 executes( (c) -> {
                                     MobAI.startTracking(
                                             Registry.ENTITY_TYPE.get(EntitySummonArgument.getSummonableEntity(c, "entity type")),
-                                            MobAI.TrackingType.byName(StringArgumentType.getString(c, "aspect"))
+                                            MobAI.TrackingType.valueOf(StringArgumentType.getString(c, "aspect").toUpperCase())
                                     );
                                     return 1;
                                 })));