Fetch package names from the platform files

[adibas03]

As mentioned in #18 , the package name is not necessarily the platform packages names, but instead of passing in the values through cli, it is much more feasible to fetch the package names from the platform files, and therefore avoid another unnecessary step. This is the same method used by react-native in the linking process.
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I am working on a PR for this, and should have it available in a day or two, after fully testing.