xspice: add most options existing in qemu
Add (copy from ui/spice-core.c) most of the options from qemu for spice server. Notable exception is per channel port selection, so the only sure way to verify all channels use the secure port (or the normal one) is to not set the port (or not set the secure port). About options: All options are settable either from environment variables called XSPICE_SOMETHING or by a SpiceSomething parameter in the Device section of the xorg configuration file. The xspice wrapper added later makes use of those environment variables and gives a more standard command line parameter interface.
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