Repository reorganisation

Unified kotlin and java into just src/main
Unified the rs09 and core packages
Took all content out of the core package, and placed it into the new content package
Reorganised all source code relating to content to be easier to find and explore

Server/src/main/core/api/MapArea.kt

@@ -0,0 +1,32 @@
+package core.api
+
+import core.game.node.entity.Entity
+import core.game.world.map.Location
+import core.game.world.map.zone.MapZone
+import core.game.world.map.zone.RegionZone
+import core.game.world.map.zone.ZoneBorders
+import core.game.world.map.zone.ZoneRestriction
+
+/**
+ * Interface that allows a class to define a map area.
+ * Optionally-overridable methods include [getRestrictions], [areaEnter], [areaLeave] and [entityStep]
+ */
+interface MapArea : ContentInterface {
+    var zone: MapZone
+        get(){
+            return zoneMaps[this.javaClass.simpleName + "MapArea"]!!
+        }
+        set(value) {
+            zoneMaps[this.javaClass.simpleName + "MapArea"] = value
+        }
+
+    fun defineAreaBorders() : Array<ZoneBorders>
+    fun getRestrictions() : Array<ZoneRestriction> {return arrayOf()}
+    fun areaEnter(entity: Entity) {}
+    fun areaLeave(entity: Entity, logout: Boolean) {}
+    fun entityStep(entity: Entity, location: Location, lastLocation: Location) {}
+
+    companion object {
+        val zoneMaps = HashMap<String, MapZone>()
+    }
+}