[CORE] Add a function to return the application directory. (#2256)

* Add a function to return the application directory.

* CI fixes

src/raylib.h

@@ -1047,6 +1047,7 @@ RLAPI const char *GetFileNameWithoutExt(const char *filePath);    // Get filenam
 RLAPI const char *GetDirectoryPath(const char *filePath);         // Get full path for a given fileName with path (uses static string)
 RLAPI const char *GetPrevDirectoryPath(const char *dirPath);      // Get previous directory path for a given path (uses static string)
 RLAPI const char *GetWorkingDirectory(void);                      // Get current working directory (uses static string)
+RLAPI const char* GetApplicationDirectory(void);                  // Get the directory if the running application (uses static string)
 RLAPI char **GetDirectoryFiles(const char *dirPath, int *count);  // Get filenames in a directory path (memory should be freed)
 RLAPI void ClearDirectoryFiles(void);                             // Clear directory files paths buffers (free memory)
 RLAPI bool ChangeDirectory(const char *dir);                      // Change working directory, return true on success