Break the controller into blueprints

[ben-kaufman]

This breaks the huge Controller file into multiple enpoints:

app.register_blueprint(auth_endpoint, url_prefix="/auth")
app.register_blueprint(devices_endpoint, url_prefix="/devices")
app.register_blueprint(price_endpoint, url_prefix="/price")
app.register_blueprint(settings_endpoint, url_prefix="/settings")
app.register_blueprint(wallets_endpoint, url_prefix="/wallets")

Also moved filters to their own file.
One more thing I didn't do yet (because I think it would make sense to do when adding the API with #713) is to move a few global endpoints (generate mnemonic + a few calls for RPC) to a separate API. I added a TODO for that in the code above the 4 endponts I would like to move to an API endpoint.

This also includes a small bugfix for validating address history on Specter DIY via QR code, the index was wrong...

[k9ert]

Nice! As soon as the 3 issues are solved, i'll try to run the cypress tests against this!

[k9ert]

I ran the cypress tests and also did some manual testing. LGTM, I'll merge today evening if tests are green and no other issues.