moved human helpers out of human.dm to new file human_helpers.dm, added two new mon helpers to check for mutations and mutantraces

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>
adds laser pointer, makes RD + lawyer + librarian spawn with one, makes laser pointer a steal objective

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>