Add standard header for defining core types
Add standard header for defining core types

Initially we only do what is necessary to get the stdint types like
uint32_t, etc.

fgouget/spice-protocol,Fantu/spice-protocol,fgouget/spice-protocol,dezelin/spice-protocol,dezelin/spice-protocol,Fantu/spice-protocol,elmarco/spice-protocol,freedesktop-unofficial-mirror/spice__spice-protocol,SPICE/spice-protocol,vdiot/spice-protocol,SPICE/spice-protocol,SPICE/spice-protocol,vdiot/spice-protocol,freedesktop-unofficial-mirror/spice__spice-protocol,fgouget/spice-protocol,vdiot/spice-protocol,elmarco/spice-protocol,dezelin/spice-protocol,elmarco/spice-protocol