A bit messy but it basically duplicates the Linux side. We don't have a
way to include NT internal defines in to FEXCore currently so the two
required symbols are just forward declared.
Adds a config option to disable pruning if desired.
Had to change FEXCore::HostFeatures slightly to remove the HostType from
the Hash for caching, as we don't want the bucket to inadvertently
delete wow64,arm64ec,linux buckets when executing in the same namespace.
Minor changes to the DiskCache::Init code to handle returning two
values, moving the HostType to be a part of the "ProcessBucketHash"
instead of the "MachineBucketHash".
Then uses the directory walking function added in the previous commit to
find mismatched/old "MachineBucketHash" directories and remove them.
Ryan Houdek