(FACT-699) Add `rubyplatform` and `system32` facts

Adds `system32` fact on Windows to report on the *native* system32 directory across 32/64 bit versions of ruby and windows.

Adds a `rubyplatform` fact for all platforms so that manifests can create conditions based on 32 vs 64-bit ruby.
@joshcooper I guess this isn't meant to be very platform agnostic...