Add basic functionality to home screen
- Make cars request
- Display cars of the user in a list
- Require car selection to continue
This solves part of https://gitlab.rlp.net/top/23s/co2/vico2izer/-/issues/141+
and completly solves https://gitlab.rlp.net/top/23s/co2/vico2izer/-/issues/96+
Edited by Klamroth, David