Single handed zoom gestures like in Google Maps and maps.me

[cbalster]

I'd also like single handed zoom gestures like in Google Maps and maps.me:
Tap + Drag up: Zoom Out
Tap + Drag down: Zoom In

Originally posted by @dreua in #249 (comment)

[cbalster]

Also check osmdroid before if they have anything we can use. Maybe this should even by implemented in osmdroid directly and be PRed with them.

[askarsyzdykov]

FYI osmandapp/OsmAnd#2617

[dreua]

I just noticed that Street complete also has this functionalty: https://github.com/westnordost/StreetComplete

[cbalster]

added with new mapsdk in #355