Allow opening projects through Tesseratos

[RiscadoA]

Description

Adds the project plugin, which adds support for the ProjectManager system argument, along with an ImGui window for opening and closing projects + launching them and terminating them.
Also adds an utility class Process to the core to handle multiple processes in a cross-platform way.

I need people with Windows and MacOS to check if this also works in other operating systems

Checklist

• Self-review changes.
• Evaluate impact on the documentation.
• Ensure test coverage.
• Write new samples.
• Add entry to the changelog's unreleased section.

[github-actions]

PR Preview Action v1.4.8
🚀 Deployed preview to https://GameDevTecnico.github.io/cubos/preview/pr-1329/
on branch gh-pages at 2024-09-29 14:11 UTC

[github-actions]

⚠️ Clang-Tidy found issue(s) with the introduced code (1/1)

[codecov]

Codecov Report

Attention: Patch coverage is 4.85075% with 255 lines in your changes missing coverage. Please review.

Project coverage is 41.09%. Comparing base (f19856a) to head (383985e).

Files with missing lines	Patch %	Lines
core/src/thread/process.cpp	0.00%	66 Missing ⚠️
engine/src/tools/play_pause/plugin.cpp	0.00%	24 Missing ⚠️
engine/src/tools/selection/plugin.cpp	0.00%	20 Missing ⚠️
engine/src/tools/world_inspector/plugin.cpp	0.00%	20 Missing ⚠️
engine/src/tools/transform_gizmo/plugin.cpp	0.00%	15 Missing ⚠️
engine/src/assets/bridges/file.cpp	0.00%	14 Missing ⚠️
engine/src/tools/plugin.cpp	0.00%	13 Missing ⚠️
engine/src/tools/toolbox/toolbox.cpp	0.00%	13 Missing ⚠️
engine/src/tools/toolbox/plugin.cpp	0.00%	12 Missing ⚠️
engine/src/tools/ecs_statistics/plugin.cpp	0.00%	11 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1329      +/-   ##
==========================================
- Coverage   42.49%   41.09%   -1.41%     
==========================================
  Files         409      428      +19     
  Lines       29229    30258    +1029     
==========================================
+ Hits        12421    12434      +13     
- Misses      16808    17824    +1016     

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