[Gtkradiant] [Bug 794] New: add a synapse item to image plugin

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=794

           Summary: add a synapse item to image plugin
           Product: GtkRadiant
           Version: 1.3
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: editor
        AssignedTo: ttimo@idsoftware.com
        ReportedBy: ttimo@idsoftware.com


image plugin needs it's synapse.config chunk
atm it's hardcoded to VFS_MAJOR, "pk3"
for q1 support for instance, it would need to be VFS_MAJOR, "wad"

if/when we add a new chunk to synapse.config, we need to update configs for all
games