Improvements since RC3

• New Custom file selector (#476)
• Favorite directories in file selector (#507)
• Recent projects in file selector (#499)
• Ripple effect in file selector (#505)
• Smart unobtrusive "rate this app" dialog (#510)
• clear value in date/time if invalid when losing focus (#464)
• fix crash when switching layer (#498)
• Respect DPI in multiline fontsize
• Value Map compatibility with QGIS 2 and lazy loading for performance improvements
• Use external valuemap model
• allow to copy text from clipboard in search bar
• respect keep scale option in locator
• optimize scale when searching points (#472)
• add frame to search results
• Fix geometry highlighting in search results (#435)
• Update to Qt 5.12.1 (only on Android 6+)