Add typehints for richer editor support
This is a very small codebase and not performance critical, and my editor does not have support for this.
[Maintenance] Use arg-parsing lib
I really don't think this is necessary since ftracker is not meant to be run from CLI in production. The only argument exists solely for debugging purposes and could just as well be removed. I don't expect further CLI options since all customization happens via the config file.
[Maintenance] Use arg-parsing lib
[Maintenance] Avoid from module import *
I think in this particular instance it makes sense though since we want the entire contents of the core namespace to be available both in main and in init(import) mode because we essentially want to pretend core is both __init__ and __main__.