Name: test_if_any_here - check if anyone is present

Syntax:
	int test_if_any_here()

Description:
	The test_if_any_here function checks if an interactive player is
	still present in the current room. The function is usually used by
	monsters, which turn off the heart beat, if nobody is present.

Return value: 
	1 if an interactive player is present, 0 if not

Examples:
	this_player()->test_if_any_here();

See also: object/heart_beat, lib/test_if_any_there