opencl: Infer autofan mode when the fan setting receives a range
opencl: Infer autoengine mode when the clock setting receives a range
opencl: Deprecate --auto-{fan,gpu} and --gpu-dyninterval options
Bugfix: Remove devtype variable from driver API

This fixes RPC ordering for non-deprecated commands, possibly at the expense of ordering in deprecated ones
opencl: Get temperature and fan speed updates with get_stats interface rather than abusing statline override interface