major rework of ythdd.py, new method for setting config in ythdd_globals.py

- slightly modified config, api keys now have the value "CHANGEME"
- requirements.txt has new dependency, flask apscheduler
- ythdd.py has been reworked, support for argument parsing has been added, code is now split into functions
- ythdd_api_v1.py features real uptime as well
- ythdd_db.py is no longer dependent on ythdd_globals.py
- ythdd_globals.py has a method for setting config and getting it from configfile variable

requirements.txt

@@ -9,3 +9,6 @@ greenlet>=3.1.0
 SQLAlchemy>=2.0.36.dev0
 Flask-SQLAlchemy>=3.1.1
 toml>=0.10.2
+Flask-APScheduler>=1.13.1
+requests>=2.32.3
+yt_dlp