Integrate sensor data with database

[outragedhuman]

No comments or docs currently, need to add some.

[outragedhuman]

Possible format:

mysql> select * from stats;
+------+--------+------+----------+-----+
| rig_id | gpu_id | temp | hashrate | time |
+------+--------+------+----------+-----+

rig_id will need to be unique
hashrate and gpu_id will be pulled from the miner output

Edit: Changed table name to stats

[outragedhuman]

Remove legacy logging for GPU sensors data at the same time.