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/filesystem.cpp

@@ -1,3 +1,6 @@
+#pragma once
+#include "strings.cpp"
+
 #pragma region File Handling
 
 #if defined( GEN_SYSTEM_WINDOWS ) || defined( GEN_SYSTEM_CYGWIN )
@@ -634,4 +637,3 @@ internal GEN_FILE_CLOSE_PROC( _memory_file_close )
 FileOperations const memory_file_operations = { _memory_file_read, _memory_file_write, _memory_file_seek, _memory_file_close };
 
 #pragma endregion File Handling
-