Use newtypes for units Px, Pct, and Auto

[maun]

No description provided.

[codecov]

Codecov Report

Merging #112 (d483269) into main (0d4eba4) will decrease coverage by 0.19%.
The diff coverage is 26.76%.

@@           Coverage Diff            @@
##            main    #112      +/-   ##
========================================
- Coverage   3.72%   3.54%   -0.19%     
========================================
  Files         51      52       +1     
  Lines       8620    8607      -13     
========================================
- Hits         321     305      -16     
- Misses      8299    8302       +3     

Files	Coverage Δ
src/views/dyn_container.rs	0.00% <ø> (ø)
src/context.rs	0.00% <0.00%> (ø)
src/views/clip.rs	0.00% <0.00%> (ø)
src/views/svg.rs	0.00% <0.00%> (ø)
src/window_handle.rs	0.00% <0.00%> (ø)
src/views/label.rs	0.00% <0.00%> (ø)
src/views/rich_text.rs	0.00% <0.00%> (ø)
src/views/text_input.rs	10.15% <0.00%> (ø)
src/views/scroll.rs	0.00% <0.00%> (ø)
src/view.rs	0.00% <0.00%> (ø)
... and 2 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more