v2-refactor

[gwleuverink]

This PR moves all of the code that does not directly involve Electron from the Electron to the Support namespace.

• Several traits and methods previously spread across commands are now encapsulated within the Native\Support\Bundler class.
• Additionally I added a native:install script to post-update-cmd automatically.

There is room for improvement, but incrementally I think this is a good first step.

Appreciate any thoughts on this!