Better constant value management (#1335)

* Starts work on #929 
* Adds Enum classes that can be accessed from JS, Jinja, and Python code. This allows for the sharing of constant values between the three major codebases in CTFd.

manage.py

@@ -12,6 +12,21 @@ manager = Manager(app)
 manager.add_command("db", MigrateCommand)
 
 
+def jsenums():
+    from CTFd.constants import JS_ENUMS
+    import json
+    import os
+
+    path = os.path.join(app.root_path, "themes/core/assets/js/constants.js")
+
+    with open(path, "w+") as f:
+        for k, v in JS_ENUMS.items():
+            f.write("const {} = Object.freeze({});".format(k, json.dumps(v)))
+
+
+BUILD_COMMANDS = {"jsenums": jsenums}
+
+
 @manager.command
 def get_config(key):
     with app.app_context():
@@ -24,5 +39,12 @@ def set_config(key, value):
         print(set_config_util(key, value).value)
 
 
+@manager.command
+def build(cmd):
+    with app.app_context():
+        cmd = BUILD_COMMANDS.get(cmd)
+        cmd()
+
+
 if __name__ == "__main__":
     manager.run()