Labelled Slide Chunks and noted unused Level Header data

Picked up on the name of the Slide_Chunks/Speeds while working on the
Project Two-Eight branch.

The level art is loaded from the zone PLCs, not by level headers.
Fixed the absurdly broken SonED2 projects and added REV01 projects

SonED2:
FZ's file was using the file layout of a completely different split of
the ROM
SBZ2 was using the wrong background layout
MZ and SBZ's project files didn't account for the unique BG layouts
Added REV01 project files

SonED2 (v1.0x)
Added REV01 project files
Merge branch 'master' into AS