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/projectile_prediction/projectile.hpp

@@ -3,7 +3,7 @@
 //
 
 #pragma once
-#include "omath/vector3.hpp"
+#include "omath/linear_algebra/vector3.hpp"
 
 namespace omath::projectile_prediction
 {