AK: Rename <AK/AKString.h> to <AK/String.h>

This was a workaround to be able to build on case-insensitive file
systems where it might get confused about <string.h> vs <String.h>.

Let's just not support building that way, so String.h can have an
objectively nicer name. :^)

Libraries/LibCore/CArgsParser.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/HashMap.h>
 #include <AK/Vector.h>
 

Libraries/LibCore/CConfigFile.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/HashMap.h>
 #include <AK/RefPtr.h>
 #include <AK/RefCounted.h>

Libraries/LibCore/CDirIterator.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <dirent.h>
 
 class CDirIterator {

Libraries/LibCore/CEvent.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/Function.h>
 #include <AK/Types.h>
 #include <AK/WeakPtr.h>

Libraries/LibCore/CFile.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <LibCore/CIODevice.h>
 
 class CFile final : public CIODevice {

Libraries/LibCore/CHttpRequest.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/URL.h>
 
 class CNetworkJob;

Libraries/LibCore/CHttpResponse.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/HashMap.h>
 #include <LibCore/CNetworkResponse.h>
 

Libraries/LibCore/CObject.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/Function.h>
 #include <AK/IntrusiveList.h>
 #include <AK/StdLibExtras.h>

Libraries/LibCore/CProcessStatisticsReader.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/HashMap.h>
 
 struct CProcessStatistics {

Libraries/LibCore/CUserInfo.h

@@ -1,5 +1,5 @@
 #pragma once
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 
 String get_current_user_home_path();