[WIP] Start breakout of mcmmo plugin

This commit starts work on the seperation of mcmmo and platform logic,
there is still a fair amount of work to go before this will compile,
down the line (potentially much further), bukkit logic will be stripped
out of -core

mcmmo-api/src/main/java/com/gmail/nossr50/mcmmo/api/McMMOApi.java

@@ -0,0 +1,4 @@
+package com.gmail.nossr50.mcmmo.api;
+
+public interface McMMOApi {
+}

mcmmo-api/src/main/java/com/gmail/nossr50/mcmmo/api/platform/PlatformProvider.java

@@ -0,0 +1,10 @@
+package com.gmail.nossr50.mcmmo.api.platform;
+
+import java.util.logging.Logger;
+
+public interface PlatformProvider {
+
+    Logger getLogger();
+
+    void tearDown();
+}