Add my own math library

GLM works only for C++ and I plan on moving to back to C. There is
a C port, but it would be good for me to figure out vertex math myself.
Hence, my own library has been created.

graphics/src/window.cpp

@@ -11,15 +11,13 @@
 
 #include "window.hpp"
 
-#include "locale_window.hpp"
+#include "locale_window.h"
 #include "utilities/logger.hpp"
 #include "vulkan_base.hpp"
 
 namespace rse::graphics::window
 {
 
-using namespace locale::window;
-
 /* Error codes */
 typedef enum {
     WINDOW_ERROR_NO_ERROR = 0U,