Remove SUPPORTED_TARGETS from CLI

[blagoev]

Currently we have a white list for supported android sdk version in CLI. This was done in the early days to protect developers from using not supported android sdks. This was especially valid when android releases were final from day 1. Nowadays android sdk enter preview/beta stages early so we can remove this hard coded list of supported sdks

Goals:

• users are able to benefit of {N} 0-day support
• users to be in control of what compile sdk version is used for their apps

[blagoev]

After short discussion with @rosen-vladimirov we decided that the best approach here is to detect the latest Android SDK that is installed and is not preview and use that as compileSDK to compile the project. If the user wants he can specify --compileSDK as a flag on the build command.