Add a DiffShowEditor showing an additional info

Task-number: QTCREATORBUG-9489

Change-Id: I3ae2e59ccaf397f4236505f21e027a42e2798784
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Petar Perisin <petar.perisin@gmail.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

src/plugins/diffeditor/diffeditor.qbs

@@ -16,6 +16,8 @@ QtcPlugin {
         "diffeditor.h",
         "diffeditor_global.h",
         "diffeditorconstants.h",
+        "diffeditorfactory.cpp",
+        "diffeditorfactory.h",
         "diffeditorfile.cpp",
         "diffeditorfile.h",
         "diffeditorplugin.cpp",
@@ -24,6 +26,10 @@ QtcPlugin {
         "diffeditorwidget.h",
         "differ.cpp",
         "differ.h",
+        "diffshoweditor.cpp",
+        "diffshoweditor.h",
+        "diffshoweditorfactory.cpp",
+        "diffshoweditorfactory.h",
     ]
 }