Fixed Bug 8091

@mi mvp drops now displays item slot, special thanks to Tepoo, Haru.
http://hercules.ws/board/tracker/issue-8091-mi-mvp-reward-equipment-slot-information-bugged/

Signed-off-by: shennetsind <ind@henn.et>
Fixed getmapxy crash

getmapxy was failing to validate whether the variables passed met the necessary criteria.
As reported in http://hercules.ws/board/topic/5113-map-crash-after-getmapxy/ by Javanese

Signed-off-by: shennetsind <ind@henn.et>
Minor script_add_str error/debug addition

intif_parse_Registers now flags/unflags parser_current_file so that any possible naming issues with the variables being loaded are referenced here (previously they'd be reported anyway but without mentioning where it came from

Signed-off-by: shennetsind <ind@henn.et>