Replace WMI value types with Variant types

[dbwiddis]

No description provided.

[codecov-io]

Codecov Report

Merging #575 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #575      +/-   ##
============================================
- Coverage     84.23%   84.08%   -0.16%     
  Complexity      195      195              
============================================
  Files            28       28              
  Lines          1434     1420      -14     
  Branches        209      209              
============================================
- Hits           1208     1194      -14     
  Misses          105      105              
  Partials        121      121

Impacted Files	Coverage Δ	Complexity Δ
oshi-core/src/main/java/oshi/util/ParseUtil.java	95.83% <ø> (-0.33%)	0 <0> (ø)

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