Editors: Automatically add editor/document id to context and use that

instead of manually adding a context everywhere.

Change-Id: I4336015a6d19349171a255e949da89b0013d6700
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/qmakeprojectmanager/qmakeprojectmanagerconstants.h

@@ -35,9 +35,6 @@
 namespace QmakeProjectManager {
 namespace Constants {
 
-// Contexts
-const char C_PROFILEEDITOR[] = ".pro File Editor";
-
 // Menus
 const char M_CONTEXT[] = "ProFileEditor.ContextMenu";