Forum improvements
Forum Activity improvements:
- Orientation changes now restore the activity properly, e.g. input text and state is retained
- Snack bar is now, when appropriate, clickable
- The bottom divider is no longer visible for the bottom entry
- Code refactoring for improved simplicity and less redundancy
- Timestamp check to ensure that new posts are not older than the latest post
Closes #426 (closed) Closes #423 (closed) Closes #424 (closed)