PSAPI: stub implementations (#4)

[Hans Leidekker]

I guess I have been too impatient with this one ;-). Now returning TRUE on
success, thanks to Juan Lang's attentiveness.

 -Hans

Changelog:
  Stub implementations for EnumPageFiles{A,W}, GetProcessImageFileName{A,W}.
  Implement GetPerformanceInfo, GetProcessMemoryInfo on top of 
  NtQueryInformationProcess and GetWsChanges, QueryWorkingSet{,Ex} on top
  of NtQueryVirtualMemory.
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