release 0.15.10

[forrestguice]

• adds layouts and resources for very small screens ([Feature request] support for smart watches #727); experimental support for wearables.
• adds 'columns' setting to moon dialog; 2, 3 or 4 columns.
• fixes bug "can't interact with app after install (flashes/strobes)" (closes Can't interact with app after install. Flashes/strobes (seizure warning) #760).
• fixes bug "custom date format is not saved"; adds calendar format pattern "EE, MMM d" (closes custom date format is not saved #759).
• fixes app crash when tapping on the date (closes Crash when tapping on date #751).
• fixes bug where the solstice widget displays "cross-quarter days" when disabled by the app ([Feature request] widget disable showing unwanted events #755).
• fixes bug where moon dialog content is clipped (Visual interface partly clipped, no scrolling #754).
• increments CalculatorProviderContract version 5 -> 6; fixes columns for "cross-quarter days".
• changes "header labels" default to "none" for translations with longer strings (de, fr, hu, nb, nl, pt_BR) (Visual interface partly clipped, no scrolling #754).
• miscellaneous updates to translations (closes Doubt about some untranslated strings #747).
• updates translations to Simplified Chinese (zh_CN) and Traditional Chinese (zh_TW) (Chinese translations #752 by James Liu). translation to zh_TW (Traditional Chinese) #680 translation to zh-CN (Simplified Chinese) #681