Reduce RL #support traffic - overlayBackgroundColor

[YvesW]

We often get #support traffic because people change their overlay color in the RuneLite settings and then resource packs resets it later on. You have created a config option to disable this, but the users are not aware.

Could you please listen to changes of the RuneliteConfig in ConfigChanged and specifically for the overlayBackgroundColor key? If the value of this key is changed while allow overlay color to be changed is enabled, could you send a chat message in a red fontthat their resource pack will override the overlay color unless they disable allow overlay color to be changed in resource packs's config settings? Alternatively, you could even disable allow overlay color to be changed via ConfigManager if the user changes overlayBackgroundColor.