Package cleanup

- authme.cache to authme.data
- Rename PlayerData to LimboPlayer to match with LimboCache
- Move authme.converter to authme.datasource.converter
- Split output package into output and message

src/test/resources/fr/xephi/authme/data/backup/sample-folder/data.json

@@ -0,0 +1,15 @@
+{
+  "location": {
+    "world": "nether",
+    "x": -113.219,
+    "y": 72.0,
+    "z": 130.637,
+    "yaw": -292.484,
+    "pitch": 24.15
+  },
+  "operator": true,
+  "can-fly": true,
+  "walk-speed": 0.2,
+  "fly-speed": 0.1,
+  "group": "players"
+}