Compositor Configuration: AvConfig macro

[Sammy99jsp]

Use a macro to declare Configuration entries:

#[AvConfig({
    // Example config macro from #23 
    "Change focus to the nth window in the taskbar."
    window(d)       => (Super+{d}),
})]
pub struct Keybinds;

This would automatically generate a struct to represent the raw values of this section,
which serde-json can then parse.

Additionally, it could add some additional parsing unitl we reach the section's final struct.

impl ConfigurationSection for Keybinds {
    type Raw = HashMap<String, Any>;
    
    fn parse(...) {
        /* .  .  . */
    }
}

This macro would then generate a default config file (from the source itself).

Additionally, this macro could also export a JSON Schema upon compile, which can then be linked with CI to be put somewhere (e.g. https://files.avdanos.org/compositor/schema.json).

Proposed Syntax

The first parameter in the macro contains the config item declarations.

A single item

Each item declaration contains:

• a description
• an identifier
• a default value

{
    "An example item"
    identifier() => "Hello World"
}

Support for config 'macros'

Custom key shortcut syntax:

{
    "Close active window"
    closeWindow() => (Alt+F4),

    "Switch to workspace `d`"
    workspace(d) => (Ctrl+Logo+{d}),
}