React Native for macOS Support

[huperniketes]

Microsoft has created a set of tools to support React Native on macOS. It would be nice to include support for it in this package.

I can supply the PR for it, but I'd like to know what the preference is for the contribution: 1. as one commit of all the changes encompassing the complete support; or 2. a series of commits where each shows a set of related changes (eg, askiOS/--removeiOS-build,wipeiOSBuild, et al in one commit; askSystemiOSPodsCache, wipeSystemiOSPodsCache, getWipeSystemiOSPodsCache, etc in another commit; and so on...)?

[huperniketes]

My changes can be seen on my fork https://github.com/huperniketes/react-native-clean-project/tree/feature-macOS-support.

[0000F8]

Bumping this for a +1 please! :)