Reload Lua mods when enabling/disabling

[StephenCWills]

Looks like the settings menu was already functional after the last PR.

This PR adds the ValueChangedCallback to reload the Lua mods when adjusting these settings. Tested using a simple Hello World mod.

local events = require("devilutionx.events")

events.GameStart.add(function()
    print("Hello world!")
end)

[AJenbo]

This is starting to come together!