spoolss: Move routing functions to a seperate file

[Detlef Riekenberg]

This is the framework for spoolss to get rid of
"@ stdcall EnumPortsW(wstr long ptr ptr ptr ptr)
winspool.drv.EnumPortsW",
while having a later option to support other provider without
restarting from scratch.

The struct for the backend is an extension to PRINTPROVIDOR.
This produced a larger patch-size for the definition of backend_t,
but makes the code using backend_t easier to read.
The change from BOOL to DWORD as result type is to help the compiler
due to PROVIDOR functions declared as BOOL, but returning ROUTER_*


-- 
 
By by ... Detlef

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