Name: drink_soft - make a player drink a soft drink

Syntax:
	int drink_soft(int soak)

Description:
	The drink_soft call makes a player drink a soft drink. Depending on
	the level, a player is not able to drink any more drinks beverages if
	he is too soaked.

	This call is mainly used in obj/soft_drink.

Return value:
	1, if successful, 0 if not.

Examples:
	this_player()->drink_soft(10);
	
See also: player/drink_alcohol, player/eat_food, player/query_soaked