Bump version to 1.17.0

Set the build code to 3000000 to restart from a round number, since the
previous sequence had drifted.
Read versionCode and versionName from pubspec.yaml through the Flutter
Gradle plugin, so the version is defined in a single place.

Add contact info

Bump version to 1.16.0

Bump version to 1.15.0

Bump version to 1.14.0

Bump version to 1.13.0

Bump version to 1.12.0

Bump version to 1.11.0

Bump version to 1.10.0

Bump version to 1.9.0