Refactors: Moves linear algebra to new directory

Moves linear algebra headers to a new subdirectory to improve project structure.

Updates includes to reflect the directory change.
Adds vcpkg to the tracked repositories.

include/omath/pathfinding/a_star.hpp

@@ -3,8 +3,8 @@
 //
 
 #pragma once
+#include "omath/linear_algebra/vector3.hpp"
 #include "omath/pathfinding/navigation_mesh.hpp"
-#include "omath/vector3.hpp"
 #include <vector>
 
 namespace omath::pathfinding