[FEATURE] Navigation of Mod Settings with Controller

[koosemose]

User Story
I was trying to guide a user of one of my mods in changing settings for use with a gamepad, but ran into difficulties when it came to changing settings. While not insurmountable, controller users (including VR users) have to either switch to keyboard and mouse (which may be inconvenient for VR users) and also their controller if it involves changing Shortcuts/KeyCodes, or drop out entirely to edit the config manually.

Envisioned Solution
Just simple response to controller, in the vein of navigating menus in vanilla Valheim. Of course, not having a way to edit strings would be more than understandable, so long as users don't get stuck in text input (such as all input going towards trying to navigate the input box).

Additional context
Discussed this with Jules on Discord, and was asked to make an issue, so here it is.