Git: Start interactive rebase from log window

Useful if local changes are already pushed to a
remote and therefore Creator refuses interactive
rebase due to missing local commits.

Task-number: QTCREATORBUG-11200
Change-Id: I2e9b9fd35b75fcb232c1358c553fe1092ce97161
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/git/gitplugin.h

@@ -95,6 +95,7 @@ public:
                            const QStringList &args) override;
     void manageRemotes();
     void initRepository();
+    void startRebaseFromCommit(const QString &workingDirectory, QString commit);
 
 protected:
     void updateActions(VcsBase::VcsBasePlugin::ActionState) override;