Add sensorMan OIDs to UPSMIB

[49phil]

This adds support for the sensorMan OIDs which are used as generic sensors for things like temperature and humidity.

Example snmpwalk of the OIDs added:

.1.3.6.1.2.1.33.1.12.1.1.0 = INTEGER: 225
.1.3.6.1.2.1.33.1.12.1.2.0 = STRING: "Channel 1"
.1.3.6.1.2.1.33.1.12.1.3.0 = Hex-STRING: C2 B0 43 
.1.3.6.1.2.1.33.1.12.1.4.0 = INTEGER: 50
.1.3.6.1.2.1.33.1.12.1.5.0 = INTEGER: 900
.1.3.6.1.2.1.33.1.12.1.7.0 = INTEGER: 50
.1.3.6.1.2.1.33.1.12.2.1.0 = INTEGER: 210
.1.3.6.1.2.1.33.1.12.2.2.0 = STRING: "Channel 2"
.1.3.6.1.2.1.33.1.12.2.3.0 = STRING: "% rel H"
.1.3.6.1.2.1.33.1.12.2.4.0 = INTEGER: 50
.1.3.6.1.2.1.33.1.12.2.5.0 = INTEGER: 900
.1.3.6.1.2.1.33.1.12.2.7.0 = INTEGER: 50

Device Documentation:
https://www.generex.de/media/pages/packages/resources/mib/c71e121b71-1666982011/RFC1628-cs1x1-Overview.pdf
https://www.generex.de/media/pages/packages/resources/mib/d22ebc95e8-1666982011/RFC1628-cs1x1.mib