[build.zig] Refactor (#5764)

* Add better structure for build.zig

Temporarily disabled the tests

* Cleanup build.zig a bit

* Fixed zemscripten and cleanup other platforms

* Make opengl_version selection more restritive

* Add traslateC to build; Renable examples

* Add raygui build to build.zig

* Deny glfw from android target

* Fix android platform includes

* Add Zig project example

* Add Zig project mention to README

* Set right name for web build in zig example

* Cleanup last parts of build.zig

* Add linking method for build.zig

* Fix lshcore link for glfw and rgfw build.zig

* Fix weird sdl linkage build.zig

* Add zig example to zig project

* Fix win32, mac build bugs in build.zig

* Rename argument lshcore to shcore build.zig

projects/README.md

@@ -13,6 +13,7 @@ IDE | Platform(s) | Source | Example(s)
 [SublimeText](https://www.sublimetext.com/) | Windows, Linux, macOS | ✔️ | ✔️
 [VS2019](https://www.visualstudio.com) | Windows | ✔️ | ✔️
 [VSCode](https://code.visualstudio.com/) | Windows, macOS | ❌ | ✔️
+[Zig](https://ziglang.org) | Windows, Linux, macOS, Web | ✔️ | ✔️
 scripts | Windows, Linux, macOS | ✔️ | ✔️
 
  *New IDEs config files are welcome!*