includes: Switch over to import statements (#224)

* Update includes and patterns to new import system

* Update namespaces to new syntax

includes/std/ptr.pat

@@ -1,13 +1,13 @@
 #pragma once
 
-#include <std/mem.pat>
+import std.mem;
 
 /*!
     The Pointer library contains helper functions to deal with pointer types.
     The `relative_to` functions are meant to be used with the `[[pointer_base]]` attribute
 */
 
-namespace std::ptr {
+namespace auto std::ptr {
 
     /**
         Use the offset of the current pointer as start address