feat: Add Toggle to Disable AI System Message Context

[animeshlego5]

A toggle has been implemented within the settings, to allow users to easily enable or disable the inclusion of the built-in default context in AI requests and only use .voidrules. Here is a video of me testing the feature https://www.youtube.com/watch?v=9rIncuNMj9U (vid was too large for GitHub). PR for issue- #628

[GEN2INK]

Thanks, this is what i want!

[andrewpareles]

Simplified + merged!

[animeshlego5]

I apologize for my beginner mistakes @andrewpareles

[andrewpareles]

No worries, thanks for the PR 🙂