Update build and project settings for Xcode 12.4

Merge pull request mattrubin#3 from bas-d/spm

Add SPM support

Merge xcode-10.2 into develop

Update build and project settings for Xcode 9

Release 1.1.2 with Carthage support

NSUInteger overflow checks

Added Podspec for version 1.1.1

Signed-off-by: Dave Poirier <[email protected]>

Update xcconfigs

1.0.2 release

bug fix release