Textmap parser

This introduces a barebones textmap parser. All of the UDMF features and changes are missing so far, and it behaves much like a binary map save for the format itself. Loading an UDMF map produces a console warning, to alert users to the fact that the format is incomplete and will change in the future.

The linedef types that abuse the texture fields to pass text parameters are broken in UDMF right now. We opted not to fix this because the fix would not be trivial and would have to be undone anyway once we implement linedef arguments.

Test files:

• srb2win-textmap.exe (Updated Jan 2)
• UDMF_0.wad