Fix Amy and Fang being able to attack other players in MP Special Stages

See merge request STJr/SRB2!558

Custom gametypes

See merge request STJr/SRB2!566

Hack P_MobjThinker into little pieces

See merge request STJr/SRB2!574

Lua: ShouldDamage/MobjDamage/MobjDeath hotfix

See merge request STJr/SRB2!575

Circle of Blue Spheres were spawning in place of Rings

See merge request STJr/SRB2!576

The original code used a switch case, not AND 1. :V

Fix ShouldDamage, MobjDamage and MobjDeath hooks all messing up the pushing of variables to Lua as function args, by adding damagetype support where it was missing!

The above issue occured only if you had both a generic hook and a type specific hook for a particular hook type. This way, the stack is never updated to include damagetype at the start, and all pushes of the variables get offsetted by 1 compared to what they should be, once the code *expects* damagetype to be included in it.

Slight touchups on the tokenizer

See merge request STJr/SRB2!569

Mapdataload refactor

See merge request STJr/SRB2!568

Hack P_SpawnHoopsAndRings into little pieces

See merge request STJr/SRB2!572

More customisable title card

See merge request STJr/SRB2!552

Wipe styles cleanup

See merge request STJr/SRB2!525

The "SRB2" directive, for warning if a SOC isn't compatible

See merge request STJr/SRB2!551

OpenGL GIF movie recording

See merge request STJr/SRB2!549

Fix model texture blending

See merge request STJr/SRB2!546

Init MUSICDEFs regardless of music state

See merge request STJr/SRB2!532

Fixed missing break in offset handling for horizontal springs

See merge request STJr/SRB2!571