Setupapi [0/6] : ReactOS setupapi patches

[Hervé Poussineau]

Hello,

As setupapi merge from ReactOS has been a recurrent demand [1], I'm doing
this set of patches.
Note that I'm not especially interested by this merge, but I do it only to
please people.
I've already spent one day to do them, I don't want to loose more of my time
[2].

Note also that I'm not the only one who can provide better patches if those
ones don't fullfill requirements.
You're welcome (yes, you! the reader of Wine-patches/Wine-devel ML) to
improve them if needed.

The goal of this set of patches is to set a solid ground to implement lots
of missing functions in setupapi.
I've tried to cut them in smallest possible parts.
Additionnaly, this patchset implements SetupDiEnumDeviceInfo and (mostly)
SetupDiGetClassDevsExW

Patch 1/6
    Move Class related fonctions to their own file devclass.c
    No code change.

Patch 2/6
    Forward SetupDiGetClassDevsA/W and SetupDiGetClassDevsExA to
SetupDiGetClassDevsExW
    This patch depends of patch 1

Patch 3/6
    Add in-memory structures needed to implement SetupDiGetClassDevsExW
in a following patch.
    Basically, we have one list container (structure DeviceInfoSet)
which will contain multiple devices (structure DeviceInfoElement) in a
chained list

Patch 4/6
    Update SetupDiCreateDeviceInfoList and
SetupDiCreateDeviceInfoListA/W to initialize all fields of in-memory
structure
    This patch depends of patch 3

Patch 5/6
    Check parameters in SetupDiGetClassDevsExW stub, and create device
set if needed.
    Now, only the real work needs to be done.
    This patch depends of patches 1, 3 and 4

Patch 6/6
    Implement SetupDiEnumDeviceInfo
    This patch depends of patches 3 and 4

Regards,

Hervé, ReactOS developper

[1] http://marc.theaimsgroup.com/?l=wine-devel&m=115721353431733&w=2
    http://marc.theaimsgroup.com/?l=wine-devel&m=113584611128655&w=2
[2] Because I'm not a Wine user, nor have Linux on my computer