Scripting improvements, implementing a mob-follow via magic item

[Volte6]

Description

This adds/changes some scripting functions, improves some scripts, and adds a magic flute, used to charm rats at night to follow the player.

Changes

• follow command now has a default time it lasts. Longer periods can be specified.
• Implemented a magic flute which when played at night, causes rats to follow the player.
• Added some new scripting functions and modified existing ones
  • Return Actor objects instead of userId/mob instance id
• Updated/improved some scripts to use changes.