* Refactor new Rect construction
Introduces methods that can be chained to construct new Rects
out of pre-existing ones
* Clamp x and y to edges in Rect chop methods
* Rename Rect clipping functions
* reverse the dependency between helix-tui and helix-view by moving a fiew types to view
* fix tests
* clippy and format fixes
Co-authored-by: Keith Simmons <keithsim@microsoft.com>