MetrO 5.3.4 in progress

After a long period without any spare time, I took a few hours today for coding :-)

I have tried to improve the text - lists synchronization feature:
- The current text entry is highlighted in the POI list (as well as in the complete stop list and the contacts list).
- Instead of opening the complete stop list on the first character entered (when there is no list on screen), the contact list is displayed if the current entry starts with an '@'.
- And other minor enhancements.

I just need to check that those changes do not have a negative impact on performance...