[SoC] GSoC OpenSurveyor week 12 report

[Pavel Melnikov]

This week was dedicated to freehand drawing feature. Prototype
implementation is added and working. Every drawing is saved as a list of
lists of GeoPoints (so it's a vector image processed via
Ramer-Douglas-Peucker simplification algorithm). Drawings do not need to be
continuous paths - a drawing is completed when a "Freehand" button is
toggled off.
Sessions also support drawings, so they are exported to XML as well (as
<drawing> elements)

Freehand UI is not very much polished, if friendly at all, so it's a work
for future week.

Binary build is in github:
https://github.com/positron96/opensurveyor/releases/tag/soc-week12
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