Added new data structures (will probably add a linked list soon also)
Updated CMakeLists.txt; s/prboom+/doom2k (etc.) and other stuff
Lots of header changes to use z_zone.h instead of other header junk
Added a circular, doubly-linked list (m_list)
Added queue methods to m_list, therefore m_queue is no longer needed, and has been removed
Added preliminary testing module; non-functional as of right now
Fix/Add foreach stuff for data structures
Add a .gitignore file from the old .hgignore file