SectionHeader no longer set width automatically

Wizard Mode for Create Plan

Start with no polygon

Use TabBar in Complex Item UI

Use consistent Altitude Mode labeling

Fix capatilization

More work on Structure Scan rewrite

Bug fixes for Structure Scan. Also includes support for Entrance/Exit Alt.

Add support for Start From Top/Bottom, plus more helpful stats

Also remove custom gimbal support

Converted Structure Scan to use CameraCalc such that it now works with
camera specs.

Fix crash when adding second structure scan