added dummy files for the model import/export, crossbuilder and sprite/thing impexp loader plug-ins. The plugins are still work in progress, and the dummy files are there to make the makefiles work.
added dummy files for the model import/export, crossbuilder and sprite/thing
impexp loader plug-ins. The plugins are still work in progress, and the dummy
files are there to make the makefiles work.


git-svn-id: 28d9401aa571d5108e51b194aae6f24ca5964c06@7107 8cc4aa7f-3514-0410-904f-f2cc9021211c

crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS