Fix crash on gui change (e.g. image remove / change) #70
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Turns out, nanogui has a problem with dangling pointers when Widgets are removed (wjakob/nanogui#331)
This PR incorporates a not-yet-merged fix for the problem (wjakob/nanogui#341) in tev's nanogui fork.
Fixes #69 (and likely also the until-now elusive crash on closing images)