Fixes Upper/Lower Casing for include paths (#487)

* Fixing upper/lower case for includes

types.h, zconf.h and zlib.h were renamed so that global includes like Types.h
are not used.

i18n/include/Text.h

@@ -1,7 +1,7 @@
 #ifndef __TEXT_H
 #define __TEXT_H
 
-#include "items.h"
+#include "Items.h"
 #include "types.h"
 #include "mapscreen.h"
 #include "XML_Language.h"

i18n/include/language.hpp

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <Types.h>
+#include <types.h>
 
 namespace i18n {
 enum class Lang