WIP - Broken Compile : Added pragma once and includes to all files + Parser fixes, and String improvements

Adding the pragma once and includes the files broke compilation, still diagnosing why.

- Some string functions were moved to the cpp, still need to do some more evaluation of it and the containers...
- Added support for forceinline and neverinline to parsing (untested)
- Added support for specifiers in operator cast such as explicit, inline/forceinline/neverinline, etc.
    - Before it only support const.
    - Still need to support volatile.
- Forceinline was not supported at all for tokenization, fixed that.

project/dependencies/header_start.hpp

@@ -1,3 +1,5 @@
+#pragma once
+
 #pragma region Platform Detection
 
 /* Platform architecture */
@@ -120,4 +122,3 @@
 #	define GEN_NS_BEGIN namespace gen {
 #	define GEN_NS_END   }
 #endif
-