* Add deployment targets for osx
* Fix bundle path to make spec tests work
On iOS, resources are directly within the bundle so the bundlePath and
the resourcePath are the same.
On macOS, resources are in a Contents/Resources subfolder so enumerating
from bundlePath causes us to look for names like
Contents/Resources/offline_spec_test, which doesn't work.
* Fix documentation warnings that show up under the macOS build
* Move GoogleTest.podspec out of the Tests tree
* Rename GoogleTests to CoreTests
* Move CoreTests to the top-level
* Move FSTGoogleTestTests.mm into core/test
Gil