Request multiple stations

Adds the ability to request data for multiple stations in a single request.

Fix Sky Cover parsing

0.0.6

use correct skyCover value

Add unique ID for Sky Condition stucts.

0.0.5

Adds a unique ID to the SkyCondition struct.

Fixes for access permissions

0.0.4

Add unique ID value to SkyCondition struct.

Make things public

0.0.3

Add unique ID value to SkyCondition struct.

Adding Observable

Adds code so the MetarLoader can be observed by a SwiftUI view.

0.0.1

add even more public keywords