fix windows 10 bugs#244

Open

MarcMenghin wants to merge 3 commits intobitpay:masterfrom

MarcMenghin:feature/fixwindows10

Commits on Apr 1, 2019

fix windows 10 (and phone) crash as camera is not ready to create a preview
MarcMenghin
committed
fix a NullPointerException if camera doesn't have an EnclosureLocation set and default to first enabled camera if none other is found (e.g. in case of a local PC webcam)
MarcMenghin
committed
fix light can never be disabled after enabling it on windows phone
MarcMenghin
committed