Fixes for eternall.wad and musinfo #122
Merged
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This adds a couple of fixes.
One is the scalestep for drawsegs being uninitialized in some wads like
eternall.wad
(from Eternal Doom PWAD, not to be confused with Doom Eternal :P), which I noticed when checkin it through valgrind (related to #118, and maybe it can fix it).I also fixed some oversights on my part when I made the MUSINFO parsing reuse the same scanner as UMAPINFO, and some warnings found by LGTM.