[REACTOS] Misc 64 bit fixes
* [NTOS:MM] Allow MEM_DOS_LIM in NtMapViewOfSection on x64 as well
* [NTOS:MM] Implement x64 version of MmIsDisabledPage
* [HAL] Remove obsolete code
* [NTOS:KE] Fix amd64 version of KeContextToTrapFrame and KeTrapFrameToContext
* [XDK] Fix CONTEXT_XSTATE definition
* [PCNET] Convert physical address types from pointers to PHYSICAL_ADDRESS
* Remove the hacky find_actctx_dll form ldr that was taken from wine. LdrpResolveDllName and LdrpCheckForLoadedDll should get a parameter that is already redirected.
* Use RtlDosApplyFileIsolationRedirection_Ustr in LdrpLoadImportModule and LdrpUpdateLoadCount3 to redirerect the input parameter.