output/Output*: drop "Output" prefix from source file name

src/StateFile.cxx

@@ -19,7 +19,7 @@
 
 #include "config.h"
 #include "StateFile.hxx"
-#include "output/OutputState.hxx"
+#include "output/State.hxx"
 #include "queue/PlaylistState.hxx"
 #include "fs/io/TextFile.hxx"
 #include "fs/io/FileOutputStream.hxx"

src/command/OutputCommands.cxx

@@ -20,7 +20,7 @@
 #include "config.h"
 #include "OutputCommands.hxx"
 #include "Request.hxx"
-#include "output/OutputPrint.hxx"
+#include "output/Print.hxx"
 #include "output/OutputCommand.hxx"
 #include "client/Client.hxx"
 #include "client/Response.hxx"

src/output/Print.cxx

@@ -23,7 +23,7 @@
  */
 
 #include "config.h"
-#include "OutputPrint.hxx"
+#include "Print.hxx"
 #include "MultipleOutputs.hxx"
 #include "Internal.hxx"
 #include "client/Response.hxx"

src/output/State.cxx

@@ -23,7 +23,7 @@
  */
 
 #include "config.h"
-#include "OutputState.hxx"
+#include "State.hxx"
 #include "MultipleOutputs.hxx"
 #include "Internal.hxx"
 #include "Domain.hxx"