* Replaced hardcoded gender codes in source
Introduced a new constant for the account based gender and replaced all hardcoded gender references to code 99 with it.
* Replaced hardcoded gender codes in npcs
Exported the gender constants into the script engine and replaced all usages with references to the constants instead of expecting a value behind them.
* Corrected a typo
Thanks to Machiezmo from Discord.
* Fixed an inverted gender logic
Thanks to @secretdataz
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