Add method for fetching theme asset names of hooks
Don't open a loading dialog message when initiating a hook because we won't necessarily know when it's completed \ cancelled
Fix a very serious bug that the Soomla iOS native API was mixed in on top of the Android API.  Now the store uses only of them, defaulting to Android on web pages
Change some APIs to accept dotted strings instead of keychain arrays
theme asset API: return an empty string instead of a placeholder image when the requested asset is a textual one (i.e. css, text)