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/utility/messaging/type/MessageInterruptTasks.h

@@ -1,21 +0,0 @@
-#ifndef MESSAGE_INTERRUPT_TASKS_H
-#define MESSAGE_INTERRUPT_TASKS_H
-
-#include "Message.h"
-
-class MessageInterruptTasks:
-	public Message<MessageInterruptTasks>
-{
-public:
-	MessageInterruptTasks()
-	{
-		setSendAsTask(false);
-	}
-
-	static const std::string getStaticType()
-	{
-		return "MessageInterruptTasks";
-	}
-};
-
-#endif // MESSAGE_INTERRUPT_TASKS_H

src/lib/utility/messaging/type/indexing/MessageIndexingInterrupted.h

@@ -0,0 +1,16 @@
+#ifndef MESSAGE_INDEXING_INTERRUPTED_H
+#define MESSAGE_INDEXING_INTERRUPTED_H
+
+#include "Message.h"
+
+class MessageIndexingInterrupted
+	: public Message<MessageIndexingInterrupted>
+{
+public:
+	static const std::string getStaticType()
+	{
+		return "MessageIndexingInterrupted";
+	}
+};
+
+#endif // MESSAGE_INDEXING_INTERRUPTED_H