[feat] implment mode options

[EdenQwQ]

Mode options:

pub struct Mode {
    pub name: String,
    pub hotkeys: Vec<Hotkey>,
    pub unbinds: Vec<KeyBinding>,
    pub options: ModeOptions,
}

pub struct ModeOptions {
    pub swallow: bool,
    pub onceoff: bool,
}

Mode options are declared after the mode name. Syntax: mode modename option1 option2

Currently, two options are implemented: swallow and onceoff

swallow: Don't emit any event through uinput. onceoff: Automatically escape a mode when a keybinding defined in it is evoked. @BlueDrink9 This may solve #164.

We can add more options by adding members to the ModeOptions struct.

[EdenQwQ]

Thanks for the changes, this looks great!

Would you mind updating the config file docs also? (swhkd.5.scd)

I can also add an issue to make us remember to update it in the future.

Updated

[Shinyzenith]

Yeah sure, go for the merge! Thanks for all the work guys. ❤️ @ajanon @EdenQwQ