- wishlists are now identified by userid instead of username, as it may change
- username changes are logged now
- added UserInfo struct containing userid and username
- type Wishlist is now a struct itself to contain the lst known username
- made everything a pointer for better performance

Resolve "Add Dockerfile and example docker-compose.yaml"

Closes #1

See merge request !1

- Translated everything (closes #4)
- Skipped already fulfilled wishes in inline keyboards
- Added debug config value