r3440: Add support for "coclass" to the pidl parser - the idl keyword that

r3440: Add support for "coclass" to the pidl parser - the idl keyword that
describes a COM class.  A coclass is the implementation of one or more
interfaces. It has a UUID referred to as it's CLSID (Class ID).

Also adding an example coclass called "CoffeeMachine". You can give
it a string (or a cup, whatever you like ;-) and it will fill it with
"COFFEE" (kind of the like the echo pipe is for regular RPC). CoffeeMachine's
Windows implementation already works, a torture test for Samba will follow
soon.
(This used to be commit 05dd840b6ffba0d38d98e2e80d856e2f2b5d877c)