Move "open" from IEditor to IDocument

For non-editor documents it currently is not used, but for editors it
makes more sense to have that on the document instead of the editor.
Most actual implementations of "open" were done in the documents already
anyhow, because it is needed for reloading.

Change-Id: I29d4df2078995cbe80172b51a9bebeecb3afad3c
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/coreplugin/idocument.h

@@ -85,6 +85,9 @@ public:
     void setId(Id id);
     Id id() const;
 
+    // required to be re-implemented for documents of IEditors
+    virtual bool open(QString *errorString, const QString &fileName, const QString &realFileName);
+
     virtual bool save(QString *errorString, const QString &fileName = QString(), bool autoSave = false) = 0;
     virtual bool setContents(const QByteArray &contents);