logic: Added indexing mode to reindex incomplete files (issue #493, #496)

* added radio buttons to start indexing dialog
* don't block task scheduler thread while start indexing dialog is visible
* don't force whole project refresh on settings change
* added help button to start indexing dialog explaining indexing modes
* disable unavailable modes when project needs full refresh
* improved label texts on indexing dialogs
* added --incomplete flag to index command of commandline API
* fixed deletion of window stack elements

src/lib/project/RefreshInfo.h

@@ -0,0 +1,23 @@
+#ifndef REFRESH_INFO_H
+#define REFRESH_INFO_H
+
+#include <set>
+
+#include "utility/file/FilePath.h"
+
+enum RefreshMode
+{
+	REFRESH_NONE,
+	REFRESH_UPDATED_FILES,
+	REFRESH_UPDATED_AND_INCOMPLETE_FILES,
+	REFRESH_ALL_FILES
+};
+
+struct RefreshInfo
+{
+	std::set<FilePath> filesToIndex;
+	std::set<FilePath> filesToClear;
+	RefreshMode mode = REFRESH_NONE;
+};
+
+#endif // REFRESH_INFO_H