Settings to use alternate basemap and imagery?

[bdlucas1]

• Move to keys.yaml
• Rotate at source
• Add menus to select basemap and imagery on settings screen?
• Provision to enter and store keys in localStorage?

[bdlucas1]

Keys moved to keys.yaml
Still need to rotate before making repo public

[bdlucas1]

Not sure about bullets 3 and 4. Change title and put on back burner.