v1.3

New features:

• "Calendar" button with a list of short-cuts to quickly set/remove threshold date on a task (@t7ko).
• Change "rename project/context" dialog -- new name now includes full name, with prefix character, and allows to edit it as well (@t7ko).
• Priority field now ignores keystrokes which are not valid priority (e.g. if you accidentally press international key when focus is in priority field, your task will stay as is and not jump to who-knows-where downwards in the list out of sight how do I find it now) (@t7ko).