This commit removes code/defines/obj.dm and code/defines/obj/weapon.dm.
These files were only kept for legacy compatibility and do not fit into
the tree system at all. It doesn't even make sense since the base defines
are all that were in these, the actual code for the items was in the right
file.
Any new ports that use this file on a different codebase should be sorted
into the tree system anyways, new files if necessary. A giant defines
file is just wasting space and searching effort.
