Disallow using signed offsets with partial_range
Add dummy parameter version to D2 matcen_info_read
Remove broken TRIGGER_MATCEN check

D1X sets flags to TRIGGER_MATCEN, not type.
Remove write-only D1X trigger field type
Use symbolic constants for trigger types
Add optional offset to partial_range
Add __attribute__((warn_unused_result)) to partial_range
Remove unused v19_door
Get rid of MarkerPoint

Hope MT's ambiguous "horrible bug" is long gone since he never said what
it was.
Remove write-only variable tmap_times_used
Remove useless Sounds[] counting loop
Skip useless sin computation
Use std::swap instead of inline swap
Remove C-only warnings
Only use defined AI path
Propagate failure in create_gated_robot
Pass pnum to boss action
Pass player number to multibot functions
Pass player number to multi functions
Add config.h inclusion for digi.cpp

Win32 builds fail without this.