Do gracefull error handling instead of panicing

[KarlK90]

The current implementation is riddled with .unwrap() calls at fallible places e.g. when setting up the display of the LXA-TAC. A panic will bring down the whole application without a meaningful error message - even in cases where a degradation of the service quality (e.g. loss of the Display) would be an acceptable error state. A better error handling would identify:

1. Critical non recoverable errors - it is okay to bring down the whole application in this case - but with appropriate error messages.
2. Critical recoverable errors, where we attempt to recover from the error state or otherwise either move to 1.
3. Non Critical errors - we shall never panic in this case but inform the user about the degradation of the service quality