Sanitized premake settings and removed unnecessary includes

[adriengivry]

Description

• Updated premake5.lua files to be more consistent
  • Revised layout to improve readability/maintainability
  • Removed unnecessary includes (some projects where referencing some include dirs that they weren't actually using)
• Moved (some) include statements from header files to source files and added forward declarations
  • This removes the need for a project (A) including another project (B) to have to also include dependencies from the other project (B)
• Removed characterset ("MBCS") from a few libs (some still use some Windows-specific code that requires it), as this option isn't recommended anymore (unicode now preferred)
• Disable warnings from dependencies (remove unnecessary noise)

Related Issues

Fixes #461
Fixes #465

Notes

As a side effect, these changes also improved build times:

Locally (Ryzen 9 3900x)

Before:

========== Build: 19 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Build completed at 5:54 PM and took 04:37.363 minutes ==========

After:

========== Build: 19 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Build completed at 5:48 PM and took 03:14.134 minutes ==========

Build Machine (GitHub)

On the build machine (GitHub workflow), it went down from 9m54 to 8m15s.