Add try-catch support

[sikvelsigma]

FunC v0.4.0 supports a try-catch block:

try {
  do_something();
} catch (x, n) {
  handle_exception();
}

Extension 1.1.5 doesn't recognize this as valid syntax:

[mnusurov]

please solve it

[sikvelsigma]

@unserialize please add try-catch support in the new version

[b1acKr0se]

This needs more attention, try catch is an incredibly useful feature and it's not nice seeing errors everywhere just by using it.