check settings endpoint

[starfys]

Please describe your issue.
want to be able to query user settings as either a machine or a webpage

Describe the solution you'd like

• endpoint at /api/v1/check_settings that has either:

qr_key and machine_key

• If these are sent, check to see if the machine key is valid, if so, return the settings of the user who checked in using the given qr key

a session header and no parameters

• If this is sent, return the settings corresponding to the user that session belongs to