First defined in: FKiSS3
When endif is processed, processing of additional actions commands no
longer depend on any previous if-else conditionals.
Example:
;@ ifequal(X, 1) ; If X equals 1 then show "doll.cel".
;@ map("doll.cel")
;@ endif() ; End of conditional block.
;@ sound("ding.wav") ; This sound is always played even if doll.cel is not shown.