Mapbox GL Custom WebGL Layers API integration

[rochoa]

Depending on the status of mapbox/mapbox-gl-js#6456, we should evaluate if we migrate from our current approach.

[Jesus89]

Steps:

• Publish v0.48.0-carto1 with custom layers
  • https://www.npmjs.com/package/@carto/mapbox-gl
  • http://libs.cartocdn.com/mapbox-gl/v0.48.0-carto1/mapbox-gl.js
• Update Layer class, remove MGL integrator
• Update examples and docs

NOTE: latest stable MGL version is v0.48.0. We should consider using this version to anticipate possible integration issues, fix possible breaking changes and be more aligned.

cc @rochoa

[rochoa]

Yes, let's use 0.48 or master (if needed).

[Jesus89]

The branch custom-layers comes from v0.47.0+. Today there are 40 commits between v0.48.0 and master. So the found regression issue is in both.

Between v0.48.0 + custom-layers VS master + custom-layers I prefer to use the stable version v0.48.0 to avoid using and releasing unstable changes for now.

cc @davidmanzanares

[davidmanzanares]

The performance regression has been mostly fixed by the last merge, see mapbox/mapbox-gl-js#7132

[Jesus89]

Closed by #886