Overhaul Native Module/ViewManager Decorators

[vincentriemer]

Blocked by babel/babel#7542, facebook/metro#92

Currently the decorators used for exposing modules/methods/view properties are utilizing the deprecated decorators babel transform and should be migrated to the spec and the new transform. This should be an opportunity to revisit the actual naming and functionality of the decorators, for example add commonly used value transformations like view style props that accept colors (need to convert from number to rgba values)

[vincentriemer]

Since Babel still hasn't added support for the new decorator spec and has all but broken the legacy decorator transform in Babel 7, I decided to migrate away from decorators altogether, and the new way of binding to native modules will be available in the next release