-Moved the MD5 check for added files up so it avoids unnecessary work when you mess up and re-add a file.
-Using compression enum for compressed lumps now.
-Vastly improved central directory seeking algorithm, big files are read fine now. Thanks a lot JTE!
-Improved remaining central directory navigation algorithm, we know and expect what data is coming from now on, after all.
-TX_ textures and sounds are replaced, but textures crash the game on mapload, and sounds are simply mute when replaced. Might have to do something with caching, I don't know yet.
-Removed a redundant boolean related to texture loading in P_AddWadFile.
-Started working on handling PK3s differently, except that I'm not sure about what I'm doing.
I don't know what to do from now on for today, so I'll leave it here for now.
-PK3 files are now properly loaded as files.
-PK3 lumps are still being treated the same way as WAD files. It means they're dependant on markers, if that makes any sense in the context of a ZIP file (it doesn't). I haven't worked out this part yet but I obviously intend to do so.
-I don't know if the lumps' position address is correct, we'll figure out when I fix the thing from above.
-Tweaked compression conditional to a switch-case format, looking towards adding several comrpession algorithms; haven't removed the previous "compressed" boolean yet.
-Added dynamically allocated name strings for lumps; haven't removed the previous name field.
-Added rudimentary PK3 central directory recognition; nothing is actually loaded in the end.
This is used by Command_Addfile in the MD5 calculation code, so that it can search subfolders properly and allow addfile in netgames to treat them the same way as in SP
Basically this makes sure numwadfiles is updated before loading the SOC/Lua scripts, so if a Lua script calls COM_BufInsertText with the contents "addfile scr_mysticrealm.wad" it can't overwrite the last written wadfile slot! Not that COM_BufInsertText really should be used like that to begin with
