PolyObject cleanup

See merge request STJr/SRB2!919

Allow some map-wide settings to be set via level header instead of sector types

See merge request STJr/SRB2!917

Add "trigger egg capsule" linedef executor

See merge request STJr/SRB2!916

# Conflicts:
#	extras/conf/SRB2-22.cfg

# Conflicts:
#	src/p_spec.c

The compiler doesn't like this and will give you a "inlining failed in call to 'P_DoTwinSpin': call is unlikely and code size would grow" error

Restore jump-related pflags properly during twinspin

See merge request STJr/SRB2!908

Delete polyobjects

See merge request STJr/SRB2!911

# Conflicts:
#	src/p_saveg.c
#	src/p_slopes.c
#	src/p_spec.c

Remove P_FindSectorFromLineTag and P_FindLineFromLineTag

See merge request STJr/SRB2!901

More thinker refactoring

See merge request !900

elevator_t cleanup

See merge request STJr/SRB2!896

# Conflicts:
#	src/p_saveg.c

Add a minimum delay between connections

See merge request !889

Fix a few strncpy bullshit

See merge request !895

Netgame $$$.sav code cleanup

See merge request STJr/SRB2!894