* [ios] #3979 wip gzip telemetry events
* [ios] expose compression from core instead of adding a new dependency
* [ios] #3979 Exposed decompress from mbgl and added a test case
* [ios] #3979 cleanup
* [ios] #3979 cleaned up test case
* [ios] #3979 cleanup
* [ios] #3979 gzip -> deflate
- OpenGL ES 2 doesn't allow NPOT textures with wrap-around
- The Sprite object reported the map's pixelRatio, even though it loaded @2x assets
- Copying icons from the sprite into the atlas now uses bilinear scaling to scale up to the actual size
