Default Module: Settings Menu

[voylin]

For the settings menu to be finished, we need to check these boxes:

• [x] Have a UI;
• [x] Setting categories;
• [ ] Cache controls; (empty/view cache, see how much MB is being taken)
• [ ] Shortcut settings;

Not necessary for now as Module system is not finished yet:

• [ ] Community Module Garden integration;
• [ ] Custom Module Settings should be displayed as well;

[voylin]

Base version completed so closing this issue

Still work which needs to be done for final version, but base system is added, updating it as we go along and add more features.

No caching right now, nor shortcuts ...