Bug fixes

Windows memory: Memory now properly (#176) calculated for total_physical_bytes and total_usable_bytes. Added documentation (#188) to clearly explain the difference between total_usable_bytes and the transient "available memory amount" (which ghw does not look at)
Windows block devices: Name gathering now looks for "ssd" in Caption field to determine SSD drive type (#177). Remove unnecessary "/dev" prefix (#165)
WMI for nil types: Fixed issue related to <nil> types being returned from WMI/WQL queries for non-pointer receiver types (#189)

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