Replace deprecated phone verification endpoint

[moritzschuh]

The /me/phone endpoint has been replaced with /me/verification, introducing the new verification method "ticket".
Existing requests to /me/phone need to be updated to make use of the new endpoint.
In case of "ticket" is specified as required verification method, a message needs to be shown to the user, asking them to reach out to support.

The return of the deprecated endpoint had the following format:
{"verify_phone":false}, requiring phone verification prior to project creation in case verify_phone was true.

The new endpoint return has the following format:
{"state":true,"type":"ticket"} User needs to reach out to a member of staff in order to create a project
{"state":true,"type":"phone"} User needs to verify their phone number in order to create a project (same as /me/phone: verify_phone:true)
{"state":false,"type":null} User is allowed to create projects without the need for verification (same as /me/phone: verify_phone:false)