Dropdown menu for Sentinel-2 tile layers

[jessedepagter]

I would propose to create a dropdown menu for the sentinel-2 tile layer, like so:

• Satellite
• Streets
• Light
• Sentinel-2 Dropdown Menu
  - Sentinel-2 (2019, EOX)
  - Sentinel-2 (2018, EOX)
  - Sentinel-2 (2017, EOX)
  - Sentinel-2 (2016, EOX)