Tgtg

- Client accept proxies
- Update version of the app in user agent
- Update version of TooGooToGo api

- remove get_all_business (not working anymore)
- use api version V6
- update default user agent to use new tgtg app version 20.8.2
- Added `set_favorite()` to add remove a fav through the api
- force usage of named params on get_items
- add some params on get items (like search_phrase)