V3.7.2 adv api

Just added some additional api commands. Can also be used for non gpu mining.
new commands:
currentpool - retrieve directly the current pool.
updatepool - update pools
strategy - set the strategy

added new field in devices:
Current Pool - the current pool (not last share pool)

If it is not possible to merge because it is based on the v3.7.2 with gpu support, sorry :)