Allow boolean operators for all Variant types

[vnen]

• Add OP_NOT for all types in Variant.
• Allow any opeand for and and or in GDScript. Those have short-circuit semantics and do not rely on Variant operators.

Fix #44688

[DaloLorn]

So... what's the status on this PR? I was hoping to continue porting my game to 4.x when 4.1 released (got halfway through before finding out about #44688 the hard way...), but at the rate it's going, I'm starting to worry it might not get into 4.1 in the first place. 😟

[akien-mga]

That hardly seems like a game breaking bug? You can simply be explicit about casting to booleans.

Edit: I just re-read that it's about porting a 3.x game, so if you have hundreds of occurrences I understand it can be a hassle.

[DaloLorn]

Yeah, I was just about to point that out. 😂

Mind you, given what I was doing with that particular bit of syntax, the simplicity is itself pretty valuable. Makes the code more legible when you have if not array instead of the multi-condition check required to emulate it in 4.0. (I can't even remember what it's like, but I'm pretty sure it was a combination of multiple checks, like array != null && array.length != 0 or something.)

[adamscott]

Looks good to me for a merge in 4.1

Thanks @vnen for the PR and the extensive unit tests.

[akien-mga]

Thanks!