Adding support for Linux

[adriengivry]

Description

On-going initiative to fully support Linux

Remaining Work

• Fix Windows/POSIX path issues
• Fix crash when opening a folder in the asset browser
• Fix project creation dialog not working (opening a project, such as Showroom works)
• Fix middle mouse button not working
• Fix Lua scripting being broken (solved by switching to clang 😄)
• Fix asset browser/MessageBox bugs:
  • Delete not working
  • Save scene on top of another scene not working
• Get tracy client to work (no linux exe at the moment). Follow up issue: Add built-in tracy profiler (front-end) to Linux builds #614
• Add convenient scripts to generate projects on Linux
• Update MSVC workflow (and add one for Linux Clang?)

Screenshot(s)