Make VM crashes useful

- Urges the user to report the bug
- Gives the user the interpreted code stack trace
- Gives the program counter at the error
- Gives the bytecode for the error
- Provides the VM stack trace, as before

Note: For some reason the diff is messed up, [go here](https://github.com/flaviut/Nimrod/commit/7692eb49f95b441e29bb4501b958157a9b70af78?w=1) for a concise version or append `?w=1` to the commit diff page.