Camera switching dropdown element addition to /v2

[waridrox]

This PR aims to achieve the following -

• Using adapterjs as a library instead of the CDN script
• Updating some styles for the interface
• Adding a dropdown element for the new interface at /v2

Make sure these boxes are checked before your pull request is ready to be reviewed and merged. Thanks!

• tests pass -- rake test
• code is in uniquely-named feature branch, and has been rebased on top of latest master (especially if you've been asked to make additional changes)
• pull request are descriptively named
• if possible, multiple commits squashed if they're smaller changes
• reviewed/confirmed/tested by another contributor or maintainer

Please be sure you've reviewed our contribution guidelines at https://publiclab.org/wiki/contributing-to-public-lab-software

Thanks!

[gitpod-io]

[jywarren]

Looks great! How does this relate to [publiclab/spectral-workbench.js] Camera switching in a dropdown list (#247) though? Thanks!!!!

[waridrox]

Oh I'm not able to get the context of #247 😅, here's the integration in the distributable file - publiclab/spectral-workbench.js#247

[jywarren]

Aha, i just linked to the wrong one - publiclab/spectral-workbench.js#247 is correct. Thank you!

[jywarren]

Once conflicts are resolved this is good to go! Thanks!