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. :^)

AK/Tests/TestFileSystemPath.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/FileSystemPath.h>
 
 TEST_CASE(construct)

AK/Tests/TestFixedArray.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/FixedArray.h>
 
 TEST_CASE(construct)

AK/Tests/TestHashMap.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/HashMap.h>
 
 TEST_CASE(construct)

AK/Tests/TestJSON.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/HashMap.h>
 #include <AK/JsonArray.h>
 #include <AK/JsonObject.h>

AK/Tests/TestNonnullRefPtr.cpp

@@ -1,7 +1,7 @@
 #include <AK/TestSuite.h>
 
 #include <AK/NonnullRefPtr.h>
-#include <AK/AKString.h>
+#include <AK/String.h>
 
 struct Object : public RefCounted<Object> {
     int x;

AK/Tests/TestOptional.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/Optional.h>
 
 TEST_CASE(basic_optional)

AK/Tests/TestQueue.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/Queue.h>
 
 TEST_CASE(construct)

AK/Tests/TestRefPtr.cpp

@@ -1,7 +1,7 @@
 #include <AK/TestSuite.h>
 
 #include <AK/NonnullRefPtr.h>
-#include <AK/AKString.h>
+#include <AK/String.h>
 
 struct Object : public RefCounted<Object> {
     int x;

AK/Tests/TestString.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 
 TEST_CASE(construct_empty)
 {

AK/Tests/TestStringView.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 
 TEST_CASE(construct_empty)
 {

AK/Tests/TestVector.cpp

@@ -1,6 +1,6 @@
 #include <AK/TestSuite.h>
 
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/NonnullOwnPtrVector.h>
 #include <AK/OwnPtr.h>
 #include <AK/Vector.h>

AK/Tests/TestWeakPtr.cpp

@@ -1,5 +1,5 @@
 #include <AK/TestSuite.h>
-#include <AK/AKString.h>
+#include <AK/String.h>
 #include <AK/Weakable.h>
 #include <AK/WeakPtr.h>