Pasi Nuutinmaki f8c4ffcdde
Fix area calculation of Face3
There seemed to be a bug in area calculation in Face3::get_area()-function. It returned the area of "imaginary" parallelogram instead of the triangle. Therefore the area returned was twice the real area. This manifested itself when using a hydro module for godot ( https://gitlab.com/ringtechsolutions/godot-tools/hydro/hydro ) causing the buoyancy to be two times the expected value.

"Reference": http://www.maths.usyd.edu.au/u/MOW/vectors/vectors-11/v-11-7.html

(cherry picked from commit a165eed73bd9783a07cdec4571a4912df71464ce)
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