Export convenience functions separately

[silvester-pari]

We have eox-map convenience functions which are not directly connected to the map. Currently, they are exported as eox-map properties, which doesn't make too much sense, it would be better to export them separately, so a user could do e.g.:

import { convenienceFunction} from "@eox/map"

const foo = convenienceFunction(bar)

List of current convenience functions:

• parseFeature
• parseTextToFeature
• getFlatLayersArray
• transform (WIP)
• transformExtent (WIP)

Version strategy

Since removing these functions from the map properties would cause a breaking change we could do the following:

• introduce convenience functions as separate exports in a v1.x with a deprecation note for the properties
• remove properties with v2.x