new command #advnpcspawn and related functions

[AiliaMorisato]

before i forget, you need to add the following to the spawngroup table
dist, max_x, min_x, max_y, min_y, delay
delay is an integer, rest are floats
default all to 0

Cripp edit:: Here is the SQL syntax for adding the fields..

ALTER TABLE `spawngroup` ADD `dist` FLOAT NOT NULL DEFAULT '0.0',
ADD `max_x` FLOAT NOT NULL DEFAULT '0.0',
ADD `min_x` FLOAT NOT NULL DEFAULT '0.0',
ADD `max_y` FLOAT NOT NULL DEFAULT '0.0',
ADD `min_y` FLOAT NOT NULL DEFAULT '0.0',
ADD `delay` INT NOT NULL DEFAULT '0';