Make io related enums to support serde Serialize/Deserialize

[ruby3141]

Is your feature request related to a problem? Please describe.

Because imgui::Key does not support serde, this kind of thing is not possible.

use serde::{Deserialize, Serialize};
use imgui::Key;

#[derive(Serialize, Deserialize)]
pub struct HoykeyConfig {
    some_hotkey: Key,
    // ...
}

Providing proxy enum to use #[serde(remote="...")] is kind of viable, but not recommendable since imgui::Key has 140 entries.

Describe the solution you'd like

Make io related enums of this crate to derive serde::{Serialize, Deserialize}.

[sanbox-irl]

We've been historically avoiding adding serde directly because we don't really have control over these types -- fundamentally they could change in a way that breaks serde compatibility.

How do you feel about making a proxy type (ie, Foo: From<imgui::Key>)?

[ruby3141]

I already did, with huge chunk of copy-pasted enum definition.
It is working, but I'm still wonder if there's other way to achieve it without copy-paste.

[sanbox-irl]

Since Rust promises the pattern-patching will always be exhaustive, I do think that your approach is actually future proofed. Annoying, yes, but future proofed.

I do the same thing with the imgui style settings for the same reason as above. For what it's worth, the reasoning that "because imgui controls this type means we can't serde it" is weak imo. If there's sufficient interest in trying, I'd probably try!