Use silica text editor labeling.

See https://sailfishos.org/sailfish-silica/sailfish-application-pitfalls.html
Use enter key customization.

See https://sailfishos.org/sailfish-silica/sailfish-application-pitfalls.html
Use Dialog instead of buttons.

Introduces platform-style gestures; see
https://sailfishos.org/sailfish-silica/sailfish-application-pitfalls.html
Merge pull request #86 from michael-k/main-page

Platform look & feel for MainPage