release 0.6.1

[forrestguice]

• adds template patterns to the "Daylight", "Civil Twilight", "Nautical Twilight", "Astronomical Twilight", "Blue Hour", "Gold Hour", and "Moon" calendars; %em (milliseconds), %eZ (azimuth), %eA (altitude), %eR (right ascension), and %eD (declination).
• adds template patterns to the "Moon" calendar; %illum (illumination %), %phase (minor phase), and %dist (distance) (closes import not populating calendar app #58).
• adds donation link to the about dialog; adds Liberapay to donation options (closes Add Liberapay to the donate options #46); https://liberapay.com/forrestguice
• improves template pattern help so that only the supported patterns for each individual calendar are shown.
• modifies default calendar templates to include the %eZ and %eA patterns.
• fixes pattern %dist to respect the Suntimes "length units" option (km or mi).
• fixes bug where "calendar update notification vibrates repeatedly" (closes calendar update notification vibrates repeatedly #59).
• bumps CalculatorProviderContract version (5 -> 7).
• updates translations to Polish (pl) and Esperanto (eo) (translations to Polish and Esperanto #60 by Verdulo