These WAD lumps should be parsed into data structures so that a non-UDMF Doom level can be represented.
THINGS
LINEDEFS
SIDEDEFS
VERTEXES
SEGS
SSECTORS
NODES
SECTORS
REJECT
BLOCKMAP
Additionally, the BEHAVIOR lump should be parsable.
A few of these overlap with the UDMF-related data that's already being parsed, and so these should be updated to use classes instead, with the vanilla versions being the parent classes.
yukiraven 
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These WAD lumps should be parsed into data structures so that a non-UDMF Doom level can be represented.
THINGS LINEDEFS SIDEDEFS VERTEXES SEGS SSECTORS NODES SECTORS REJECT BLOCKMAP
Additionally, the BEHAVIOR lump should be parsable.
A few of these overlap with the UDMF-related data that's already being parsed, and so these should be updated to use classes instead, with the vanilla versions being the parent classes.