Explain to user why Turing machine crashed

**Describe the feature**
Currently user gets notified when Turing machine crashes like this: Machine crashed due to missing instruction.
However, it can be not totally clear what is missing.
Better error explanation.: Machine crashed due to missing instruction: q2 (state), 1 (symbol). Fix example: Add line q2, 1 -> q2, 0, S in the instruction table.

**Describe alternatives you've considered (optional)**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**