Add battle stuff

cutscene/battle/BattleStartAction.gd

@@ -0,0 +1,16 @@
+class_name BattleStartAction
+
+static func startBattleCallable(params:Dictionary) -> int:
+  assert(params.has('fighters'))
+  SCENE.setScene(SceneSingleton.SceneType.BATTLE)
+  BATTLE.startBattle({
+    'fighters': params['fighters'],
+    'cutscene': params['cutscene']
+  })
+  return Cutscene.CUTSCENE_CONTINUE
+
+static func getStartBattleCallable(fighters:Dictionary) -> Dictionary:
+  return {
+    "function": startBattleCallable,
+    "fighters": fighters
+  }