ImGui-based console

[Meakk]

• Introduce a new output window based on ImGui. This new output window will duplicate the logs sent to the terminal in case the user isn't using F3D from the terminal.
• The output window for Windows relying on an external window has been removed.
• This new log window can be accessed by pressing the key Escape.
• The previous binding to Escape that will quit the application has been removed.
• The new command to quit the application exit is added in the application.
• When a new warning or error is logged and the console is hidden, a small icon on the top right corner will show up to inform the user. The user can then press Escape or click on the icon.
• At the bottom of the log window, an input field is available to the user where they can type any command registered in F3D.
• In order to fix a warning always reported to the user when not using GLX in automatic rendering backend mode, the VTK logic has been mimicked but the GLX context selection is now silently failing.

Badge informing the user a new warning is logged:

The console opened, showing all the logs:

[mwestphal]

still needs work

[github-actions]

You are modifying libf3d public API! ⚠️Please update bindings accordingly⚠️!
You can find them in their respective directories: python, java, webassembly.

[codecov]

Codecov Report

Attention: Patch coverage is 97.12919% with 6 lines in your changes missing coverage. Please review.

Project coverage is 76.30%. Comparing base (7f8aeb6) to head (339992a).
Report is 32 commits behind head on master.

Files with missing lines	Patch %	Lines
library/src/window_impl.cxx	60.00%	4 Missing ⚠️
vtkext/private/module/vtkF3DEGLRenderWindow.cxx	83.33%	1 Missing ⚠️
vtkext/private/module/vtkF3DImguiObserver.cxx	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1748      +/-   ##
==========================================
+ Coverage   75.95%   76.30%   +0.35%     
==========================================
  Files         120      124       +4     
  Lines       12009    12194     +185     
==========================================
+ Hits         9121     9305     +184     
- Misses       2888     2889       +1     

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[mwestphal]

Some changes needed

[mwestphal]

one small optional change if you want