Don't depend directly on Vault in MoneyThingParser.

It turns out that the method reference on MobArena#getEconomy() in ThingManager is a tight enough dependency on Vault's Economy interface that it results in a NoClassDefFoundError if Vault isn't present.

By resorting to a more "naive" approach of resolving the Economy instance from the main plugin class on every parse call in MoneyThingParser, the NoClassDefFoundError is avoided along with the load/enable ordering issue that was fixed with the lazy-fetching in commit 2fcb20b2ae.

This reverts 2fcb20b2ae and partly 4c34a183c7.

Fixes #463

src/main/java/com/garbagemule/MobArena/things/MoneyThingParser.java

@@ -1,17 +1,15 @@
 package com.garbagemule.MobArena.things;
 
-import net.milkbowl.vault.economy.Economy;
-
-import java.util.function.Supplier;
+import com.garbagemule.MobArena.MobArena;
 
 class MoneyThingParser implements ThingParser {
     private static final String PREFIX_LONG = "money:";
     private static final String PREFIX_SHORT = "$";
 
-    private Supplier<Economy> economy;
+    private MobArena plugin;
 
-    MoneyThingParser(Supplier<Economy> economy) {
-        this.economy = economy;
+    MoneyThingParser(MobArena plugin) {
+        this.plugin = plugin;
     }
 
     @Override
@@ -20,7 +18,7 @@ class MoneyThingParser implements ThingParser {
         if (money == null) {
             return null;
         }
-        return new MoneyThing(economy.get(), Double.parseDouble(money));
+        return new MoneyThing(plugin.getEconomy(), Double.parseDouble(money));
     }
 
     private String trimPrefix(String s) {

src/main/java/com/garbagemule/MobArena/things/ThingManager.java

@@ -12,7 +12,7 @@ public class ThingManager implements ThingParser {
     public ThingManager(MobArena plugin, ItemStackThingParser parser) {
         parsers = new ArrayList<>();
         parsers.add(new CommandThingParser());
-        parsers.add(new MoneyThingParser(plugin::getEconomy));
+        parsers.add(new MoneyThingParser(plugin));
         items = parser;
     }