NGCTitled, NGCClock, NGCSquare: ported versions of old scripts, mostly complete.
NGCIntro, NGCScenario: ported versions of old scripts, revised for new intro sequence.
NGCFlag: ported version of ConfirmVerb, also inheriting from NGCTitled.
NGCGame: use RenderType instead of M-Transparent metaprop; send Reveal message to pieces instead of FadeIn; destroy proxies instead of fading out; read proxy scale property again; use rank_offset and file_offset parameters.
NGCPiece: add fade support, handling Reveal message; add subtitle support; face enemy on all repositions; check the victim's DeathStage for the attacker, not the victim; use grave_offset parameter.
ChessSet: new struct organizing set-related functions.
HUDMessage: new support class based on KDScript's HUDSubtitle.
Positions: fix old issue with captured squares; fix new issue with FEN de/serialization.
Engine: allow debug output to be enabled by qvar.
Piece, Side: add LGMulti wrappers.
Check: move from ChessGame unit to Chess unit.
Return HALT instead of CONTINUE from most message handlers for efficiency.