Priority Switcher 0.5

Priority Switcher 0.5.00 is available for download now. It includes the following new functionalities:

1. Added: option to enable/disable changing priority by clicking on a priority icon in the thread pane
2. Added: option to warn before deleting starred messages
   

New strings are not translated; they have been translated by translator at BabelZilla. I'm going to release 0.5.10 when the translation is done.