better handle resources (tiles/tileset) loading and sharing
Now the resources are installed and a lookup is performed to find them from either (respectively) an environment var, the user's datadir and the compile-time datadir. Also the server is responsible for sharing the xml data so that all clients get the same thing, from him over network. Also libovcc is responsible for the DTD files (since it's a sort of spec) while the actual XML data belongs to the server.
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