fix #948
This pull request improves the sharing of PGNs:

• The values of entered text are now saved automatically, so the user doesn't need to submit to save the text.
• Submitting a field automatically jumps to the next one and selects all text. If the next field is the "Result" field, a choice picker will appear.
• Tapping on a field automatically selects all the text.

Remarks:

• not tested on iOS