feat: add info switch functionality

[TobyBridle]

Allow modules to provide a way to switch between modes within the info page.
This is done using the following interface

interface SwitchConfig {
    // E.g ["Dub", "Sub"]
    options: [string, string];
    // E.g 0 ("Dub")
    default: number;
    // E.g True to not request the same URL twice (does not hold true across seasons)
    cache: boolean;
    // E.g True to re-request the Info page as well
    includeInfo: boolean;
}

The module must then implement a getSwitchConfig function which returns this SwitchConfig.
Within the module, the value of the switch can be retrieved via getSwitchValue.
For example, to get the label for the active option, you would do:

const appSwitch = switchConfig.options[getSwitchValue()];
// switch is 0 -> appSwitch = "Dub"
// switch is 1 -> appSwitch = "Sub"

[TobyBridle]

I have purposefully not made this a draft so that it can build - please DO NOT merge yet.

[TobyBridle]

I was going to increment the format version for this but, since it's backwards compatible anyway, I don't think I will