app: Rename gimptoolview.[ch] to gimptooleditor.[ch]

Rename gimptoolview.[ch] to gimptooleditor.[ch]. The contents of the
file has already gone through this change, we do the file name change
separately for better diffs. Part of fix for bug #500930.

app/widgets/Makefile.am

@@ -295,10 +295,10 @@ libappwidgets_a_sources = \
 	gimptoolbox-indicator-area.h	\
 	gimptooldialog.c		\
 	gimptooldialog.h		\
+	gimptooleditor.c		\
+	gimptooleditor.h		\
 	gimptooloptionseditor.c		\
 	gimptooloptionseditor.h		\
-	gimptoolview.c			\
-	gimptoolview.h			\
 	gimpuimanager.c			\
 	gimpuimanager.h			\
 	gimpundoeditor.c		\

app/widgets/gimptooleditor.c

@@ -33,7 +33,7 @@
 
 #include "gimpcontainerview.h"
 #include "gimpviewrenderer.h"
-#include "gimptoolview.h"
+#include "gimptooleditor.h"
 #include "gimphelp-ids.h"
 #include "gimpuimanager.h"
 #include "gimpwidgets-utils.h"