Cleanup includes, remove stdio.h from base

core_main.cpp

@@ -258,7 +258,15 @@ For modules it's a bit different cause they should be distributed as valid.
 */
 
 #include "base.cpp"
+
+#define STB_SPRINTF_IMPLEMENTATION
+#include "stb_sprintf.h"
+
 #include "base_unicode.cpp"
+#include "base_arena.cpp"
+#include "base_data_structures.cpp"
+#include "base_string.cpp"
+
 #include "os.h"
 #if OS_WINDOWS
 #include "os_windows.cpp"