Feature request: sound notification when nearby a quest

[NotSoImportant]

Use case
When going outside I don't want to look at the phone all the time. But once I get along one of my selected quests I can turn it on and contribute.

Proposed Solution
Configurable sound when near a quest. Default disabled.

I know that if you like to there is a quest every few meters. When having all quests selected it won't help.
Alternatively this could be a setting per quest type, like giving a hint about quests I see as important.

[westnordost]

Well, nice idea to have it enabled for specific quests based on user preference. This is a duplicate of #48 though