Properties are now registered in order of declaration

[Bromeon]

Older change, not yet merged.

Properties exported via #[property] appear in arbitrary order in the editor, and the order can change on each rustc compilation. This is due to the inner workings of HashMap, which orders its element non-deterministically as a security feature.

This code:

#[derive(gd::NativeClass)]
#[no_constructor]
pub struct GodotGraph {
    #[property] first: i32,
    #[property] second: bool,
    #[property] third: Color,
    #[property] fourth: Vector2,
}

can lead to any of these variants:

This PR makes the order follow the declaration order, by using Vec instead of HashMap.

bors try

[bors]

try

Build succeeded:

• ci

[Bromeon]

bors r+

[bors]

Build succeeded:

• ci