* Added LFN lookup and hashing for WadDirectory
* Rewrote resource coalescence again to work in a single pass
* Refactored handling of namespaces and added WadIterator base class, and WadNamespaceIterator for walking all lumps in a certain namespace.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2421 86ba831e-150c-0410-ab35-e06eaae15ed9