cache entities to avoid allocations

Signed-off-by: Folling <mail@folling.io>

include/ikarus/global.h

@@ -1,6 +1,6 @@
 #pragma once
 
-/// \file memory.h
+/// \file global.h
 /// \author Folling <folling@ikarus.world>
 
 #include <ikarus/macros.h>
@@ -9,8 +9,12 @@
 /// \brief Information relevant to the entire library.
 /// @{
 
+IKARUS_BEGIN_HEADER
+
 /// \brief Frees a pointer allocated by ikarus. Every pointer returned by a function must be freed using this function unless
 /// explicitly stated otherwise.
 IKA_API void ikarus_free(void * ptr);
 
+IKARUS_END_HEADER
+
 /// @}