Fixed compile issues in latest XCode release#15

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UberNick wants to merge 4 commits intostefanhafeneger:masterfrom UberNick:master

+601-2,492

Commits on Oct 12, 2018

fixed some compiler warnings and errors due to version updates
Nick Matelli
committed
removed remaining compile issue
Nick Matelli
committed
updated project settings to use ObjC ARC
Nick Matelli
committed

Commits on Apr 29, 2019

Updated project configuration to allow compilation in latest XCode
UberNick
committed