rEvolt cutscenes: Morcant

Initialize cutscene for Morcant.

All monsters will vanish during the cutscene, this is not a bug. Player will be made immobile in two different ways.

It is up to ManaPlus developers implement display for at least one. If they don't, then well, that is not my job to worry with. DEAL WITH DESYNC.

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Note: Depends on !243 (merged) being merged.
Superseeds and closes evol-all#74 (closed)