[SoC] GSoC OpenSurveyor 13th week report

[Pavel Melnikov]

Major features added this week:

   - Freehand drawing mode has a contextual actionbar with options to
   cancel creation, delete last drawn segment, change width and color of the
   line. Freehand editing is finished by clicking check mark in the context
   actionbar, or by clicking a trashcan button.
   - Marker creation in map UI has an option to cancel creation and to move
   marker being created (it was created in the center of the screen before)
   - Long-tap on the marker allows to move it (by dragging) and delete it
   (trashcan button in context actionbar)

Minor features:

   - Pinch-zoom
   - Maximum zoomlevel is set 20.
   - Workaround osmdroid's setCenter method

Now there is also an open question on how to better add marker-related
features to map ui. I am not sure that propagating buttons and property
window from button part of the app (but making buttons smaller) is the
right choice. Current solution (plain creation of text marker) is obviously
not an option.

Binary build can be found here:
https://github.com/positron96/opensurveyor/releases/tag/soc-wee13
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