Move all common Dll[un]RegisterServer stuff to advapi

[Vijay Kiran Kamuju]

Hi All,

I would like to move all the helper functions register_coclass,etc to
a separate file in advapi.dll called regsvr_helper.c and all
declarations of structs, consts moved to a separate file called,
wineregsvr.h in include/wine

So that it would be easy for other dlls to implement the
DllRegisterServer and DllUnRegisterServer.
And also clean up the code base.

I need your suggestions, before i submit patches.

Thanks,
Vijay