[as3] generate variable field access on interfaces as `class["field"]` (see #3159)
[as3] generate variable field access on interfaces as `class["field"]` (see #3159)

pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe