chore(kate): Move kate back to "common" as it is cross-platform

- Link Kwrite config with Kate

common/.config/kate/externaltools/Qt%20Quick%202%20Preview%20%28qmlscene%29.ini

@@ -0,0 +1,13 @@
+[General]
+actionName=externaltool_QtQuick2Previewqmlscene
+arguments=%{Document:FileName}
+category=Qt
+cmdname=qml-preview
+executable=qmlscene
+mimetypes=text/x-qml
+name=Qt Quick 2 Preview (qmlscene)
+output=Ignore
+reload=false
+save=CurrentDocument
+trigger=None
+workingDir=%{Document:Path}