Improve try catch

[XmiliaH]

Improve the try catch block.

Currently the try catch block has a bug where mixed return and fallthrough in a try block will always return, even in the fallthrough case.

Furthermore, try blocks did not allow for break, continue, and gotos to jump out of the body.

Now, the try block function will return a return type and up to two extra results for the one and two argument returns. Some of the return types are

• nil: Fallthrough of the try block
• 0: Return with zero arguments
• 1: Return of the argument in the first extra result slot
• 2: Return of two arguments found in the two extra result slots
• 3...: Dynamically assigned for gotos including break & continue
• table: Return of three or more or multiple arguments packed into the table with table.pack(...).

[Sainan]

This was probably already some of the most cursed code, and this is definitely not making it any less cursed, but tests are passing, so it "looks good to me".