Feature/eui keys config

[elsalahy]

Summary:

An effort to reduce the complexity of configuring the keys and EUIs for applications with SW based LoRaWAN credentials.

Relates to #133 and #56 but doesn't close them as it's a stopgap solution.

Changes:

• Defaults the LoRaWAN OTAA activation information to v1.0.2
• Adds some documentation to help users navigate to the configuration and setup the apps

Notes for Reviewers:

A stopgap until we make it extremely simple. The keys order/format is exactly the same as V3 😄 to make it super simple.

Release Notes: (optional)

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[elsalahy]

@azerimaker please keep the update in mind, but no need to review.

[elsalahy]

Thanks @marnixcro for the review and feedback, it's helpful

[elsalahy]

@johanstokking would love your quick feedback on this before merging