fw1.8-harp1.15

What's Changed

• Rename license file by @artursilva0 in #9
• Include device metadata file as embedded resource by @artursilva0 in #10
• Updated to atxmega core 1.15 by @artursilva0 in #13

Full Changelog: fw1.7-harp1.13...fw1.8-harp1.15