made targets for macOS and tvOS, some cleanups#31

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ssbmaccom wants to merge 6 commits intoPeqNP:masterfrom

ssbmaccom:tvOS_macOS

Commits on Dec 7, 2017

made targets for macOS and tvOS, some cleanups
ssbmaccom
committed

Commits on Dec 12, 2017

Commits on Jan 4, 2018

smaller changes for iOS target
ssbmaccom
committed

Commits on Jun 28, 2018

small fixes
ssbmaccom
committed