To be able to add pins/notes on the map

[ ] To add a red Add a note toolbar button between the temporary layers and the add a POI buttons.
[ ] Use the thumb tack icon for it.
[ ] A note includes: name, description, lat/lon.
[ ] The notes have to be saved in the database (to be available across multiple devices), only visible by the user and served with the other data when loading the theme.
[ ] The markers have to look like a thumb tack too (easier to understand by the user).

mapcontrib / mapcontrib