Needs an "undo" option

[pigsonthewing]

After inadvertently adding the wrong kind of PoI, or a note which I realise is wrong, I would like to have an "undo" option.

[Lee-Carre]

While I'm not disagreeing, see also

• In a track's Waypoint List, tap to edit text or delete waypoint #39
• allow editing/deleting waypoints #171

[FR3DD221]

Already solved on PR #509