Add set_remaps function

[char3210]

This allows changing the remaps without fully reloading the config, which for example allows remaps to be toggled:

local remaps = { -- anything
    ["B"] = "N",
    ["N"] = "M",
    ["M"] = "B",
}

local config = {
    input = {
        remaps = remaps,
        ...
    }
    ...
}

remaps_toggled = true

local toggle_remaps = function()
    remaps_toggled = not remaps_toggled
    if remaps_toggled then
        waywall.set_remaps(remaps)
    else
        waywall.set_remaps({})
    end
    return false
end

config.actions = {
    ["U"] = toggle_remaps,
}

return config

This is probably not the best way to structure the code, I'm open to suggestions.

[char3210]

another interesting option is some sort of apply_config(config) function that reloads the config table. this lets you modify anything you'd want during runtime except maybe experimental.jit

[tesselslate]

Works as expected for me, with some small tweaks (leak fix + style nit) it'll be fine

[tesselslate]

I would prefer if these functions are prefixed with config_ if they're public

[tesselslate]

another interesting option is some sort of apply_config(config) function that reloads the config table. this lets you modify anything you'd want during runtime except maybe experimental.jit

I think this function probably covers the last of the config options which people would realistically want to change at runtime since most of the other options were already covered but I'm not totally sure. Disabling and enabling the JIT is fine; the config loading code already does it since it has to first execute init.lua before knowing the option's value.

[tesselslate]

Thanks for the PR!