Removed JASidePanel, fixed warnings and added Settings modal

**Major Changes:**
- I removed the side panels, as I felt it wasn't really necessary with two items, and cleaned up some warnings (none that I know of left).

**Minor Changes:**
- I also added a Settings modal from "Home" (to replace panels), and also added the gear icon.
- Fixed `int` warnings, and selector warnings.
- Cleaned up `PhishOD-Prefix.pch`.