* Added the optional parameter <npc name> to npcspeed to change the walking speed of the npc with the said name.
Usage : npcspeed( <speed value> {,"<npc name>"} );
* Added the optional parameter <npc name> to npcwalkto to move the npc with the said name at the given coordinates.
Usage : npcwalkto( <x>,<y> {,"<npc name>"} } );
* Added the optional parameters `<npc name>` and `<flag>` to `npcstop` to stop the movement of the npc with the said name with options.
Usage : `npcstop( {"<npc name>", {"<flag>"}});`
Co-authored-by: Lemongrass3110 <lemongrass@kstp.at>
Co-authored-by: Aleos <aleos89@users.noreply.github.com>