Implement App Settings

🚀 Feature Proposal

As a user I want to have the possibility to

• change my password #17
• toggle Crashlytics on/off
• toggle notificaitons on/off

Motivation

The user might want to change his password at some point.

The user should have the freedom to decide himself/herself whether he/she wants to send us Crashlytics data. This decision might change during the usage of the app.

The user should have the freedom to decide whether he/she wants to receive push notifications

Technical Details

• Change password -> new screen #17
• Toggle Crashlytics on/off -> call Firebase API
• Toggle notificaitons on/off -> call Firebase API (?)