Add skeleton for webgl immediate renderer
Revert "Remove DragZoom from default interactions"

This reverts commit c2330b978644da6e5fb3d9447a5e5ce20e62ed93.
Remove dragzoom example

Since it has been re-added to default controls
Do not draw a rotated box, in dragbox/dragzoom

Use pixels to draw a straight box, perserving rotation while zooming
Animate DragZoom
add Immediate renderer to webgl layer postcompose event
Merge pull request #1452 from tonio/vector-api-dragbox-webgl

[vector-api] Re-enable dragzoom for every renderer