Panel resizing

[erri120]

Resolves #705. Part of #674.

• Panels can be resized.
• Panels have space in between them.
• Future TODO: Panel resizing improvements #791
• Hovering and interacting with the resizer should change the mouse icon.
• Bugs:
  • Cursor icon doesn't change in previewer? Maybe doesn't change at all, I have no idea.
  • Wrong control is removed from the Children list.
  • Space isn't expanded for the other control correctly.
  • Resizers are at the wrong position after a panel has been closed.
  • New panel icons aren't updated when the user stops resizing
  • No minimum size for panels.

[codecov]

Codecov Report

Merging #787 (00bd2c9) into main (8dab9fa) will increase coverage by 0.59%.
Report is 7 commits behind head on main.
The diff coverage is 37.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #787      +/-   ##
==========================================
+ Coverage   62.40%   62.99%   +0.59%     
==========================================
  Files         611      586      -25     
  Lines       18572    18125     -447     
  Branches     1307     1277      -30     
==========================================
- Hits        11590    11418     -172     
+ Misses       6632     6365     -267     
+ Partials      350      342       -8     

Flag	Coverage Δ
Linux	62.36% <37.41%> (+0.63%)	⬆️
Windows	62.16% <37.41%> (+0.52%)	⬆️
clean_environment_tests	62.98% <37.41%> (+0.58%)	⬆️
network_tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/NexusMods.App.UI/Theme/IconStyles.xaml	98.79% <100.00%> (+0.06%)	⬆️
src/NexusMods.App.UI/WorkspaceSystem/GridUtils.cs	92.41% <96.38%> (+3.38%)	⬆️
src/NexusMods.App.UI/WorkspaceSystem/MathUtils.cs	94.33% <88.46%> (-5.67%)	⬇️
...kspaceSystem/PanelResizer/PanelResizerViewModel.cs	0.00% <0.00%> (ø)
...UI/WorkspaceSystem/Workspace/WorkspaceViewModel.cs	0.00% <0.00%> (ø)

... and 99 files with indirect coverage changes

[Al12rs]

Testing the code locally, a lot of the interactions caused pretty bugged out states of the view, I would prefer if we at least were sure about the causes of these bugs before merging this.

[Al12rs]

Is this TODO still relevant?