Don't panic

[Sharktheone]

It is probably a good idea to have gosub to be no_panic. We can check that with no_panic

However I'm not sure, how that will be with dependencies, for example the v8 bindings also can panic. We might need to fork them and replace panics with error propagation. But for now the best solution is probably to just have all gosub crates `no_panic´ and care about external dependencies later.