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/enums/ESpecifier.csv

@@ -4,6 +4,7 @@ Constexpr,        constexpr
 Constinit,        constinit
 Explicit,         explicit
 External_Linkage, extern
+ForceInline, 	  forceinline
 Global,           global
 Inline,           inline
 Internal_Linkage, internal