Enable all compilation warning on unix platforms

[Lgt2x]

Pull Request Type

• [ ] GitHub Workflow changes
• [ ] Documentation or Wiki changes
• [x] Build and Dependency changes
• [ ] Runtime changes
  • [ ] Render changes
  • [ ] Audio changes
  • [ ] Input changes
  • [ ] Network changes
  • [ ] Other changes

Description

Enable -Wall on Unix compilers, in order to catch more problems in the code. Cleanup global compile options, that referred to unset variables

[winterheart]

Need resolve conflicts, otherwise is good to merge.

[Lgt2x]

rebased

[winterheart]

Ready to merge.