'Small' update

- Add Course Mode
- Add support for downloading additional files
- Add support for `skill_fatalis` (Hikari booms your world.)

- Delete my hair X<

> WHERE IS MY TAIRITSU ?!
> Some other things are not supported now, such as... the feature which is one line above.

latest version/server/course.py

@@ -0,0 +1,33 @@
+from core.constant import Constant
+from core.course import UserCourseList
+from core.error import ArcError
+from core.item import ItemCore
+from core.sql import Connect
+from core.user import UserOnline
+from flask import Blueprint, request
+
+from .auth import auth_required
+from .func import error_return, success_return
+
+bp = Blueprint('course', __name__, url_prefix='/course')
+
+
+@bp.route('/me', methods=['GET'])
+@auth_required(request)
+def course_me(user_id):
+    with Connect() as c:
+        try:
+            user = UserOnline(c, user_id)
+            core = ItemCore(c)
+            core.item_id = 'core_course_skip_purchase'
+            core.select(user)
+            x = UserCourseList(c, user)
+            x.select_all()
+            return success_return({
+                'courses': x.to_dict_list(),
+                "stamina_cost": Constant.COURSE_STAMINA_COST,
+                "course_skip_purchase_ticket": core.amount
+            })
+        except ArcError as e:
+            return error_return(e)
+    return error_return()