v5: Splitting XYZ/MAPP.UI

[dbauszus-glx]

This discussion is in regards to moving the mapp and mapp.ui library into their seperate Open Source repositories.

Build [dev] dependencies are only required by the front end libraries and don't really have to be deployed. The front libraries repo can have dist folder for builds of each versioned release.

There will be fewer issues relevant to a particular codebase.

The mapp library is meant to work without the ui library to create a mapview widget which abstracts the layer and locations for render in openlayers.

We will create a mapp repo first to test this out before removing the mapp components from the XYZ repo.

Deployments for shared templates won't need any front end libraries at all.

Release cycles and testing will be improved by having a seperate XYZ and MAPP repository.

[dbauszus-glx]

The mapp library repo should bundle Openlayers from the package. openlayers/openlayers#16925 (comment)