[openrr-gui] Use iced_style_config

[taiki-e]

cc #101

refs: https://github.com/taiki-e/iced_style_config

Resolves the following TODO:

openrr/openrr-gui/src/style.rs

Lines 1 to 2 in 1896893

	// TODO: It's painful to recompile this crate every time I change the style.
	// So remove and replace with https://github.com/taiki-e/iced_style_config or alternatives.

It also supports hot reloading of style sheets. This is useful for adjusting styles during development.

gui.mov

[codecov]

Codecov Report

Merging #663 (2936913) into main (4ce27af) will increase coverage by 0.95%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #663      +/-   ##
==========================================
+ Coverage   59.07%   60.03%   +0.95%     
==========================================
  Files         117      117              
  Lines       13704    13486     -218     
==========================================
  Hits         8096     8096              
+ Misses       5608     5390     -218     

Impacted Files	Coverage Δ
openrr-apps/src/bin/joint_position_sender.rs	25.00% <0.00%> (-1.09%)	⬇️
openrr-apps/src/bin/velocity_sender.rs	28.57% <0.00%> (-1.43%)	⬇️
openrr-gui/src/error.rs	0.00% <ø> (ø)
openrr-gui/src/joint_position_sender.rs	0.00% <0.00%> (ø)
openrr-gui/src/style.rs	0.00% <0.00%> (ø)
openrr-gui/src/velocity_sender.rs	0.00% <0.00%> (ø)

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[OTL]

Oh,great!