logic: Fixed and improved indexing interruption (issue #634)

* Fixed indexing can be interrupted when dialog hidden
* Clear intermediate storages when interrupting
* Abort waiting for less queued storages when indexing interrupted
* Don't index another file when indexing was already interrupted
* Moved indexing interrupted progress dialog to TaskBuildIndex
* Use MessageIndexingInterrupted instead of MessageInterruptTasks

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -41,7 +41,6 @@
 #include "MessageEnteredLicense.h"
 #include "MessageFind.h"
 #include "MessageIndexingShowDialog.h"
-#include "MessageInterruptTasks.h"
 #include "MessageLoadProject.h"
 #include "MessageRefresh.h"
 #include "MessageRefreshUI.h"
@@ -493,7 +492,6 @@ void QtMainWindow::keyPressEvent(QKeyEvent* event)
 			break;
 
 		case Qt::Key_Escape:
-			MessageInterruptTasks().dispatch();
 			emit hideScreenSearch();
 			break;