"Kar 98" alias for the Mauser 98

BUR #35039 is pending approval.

create alias kar_98 -> mauser_98
create alias kar98 -> mauser_98
create alias karabiner_98 -> mauser_98

For some reason, there's no alias for the Kar 98 rifle for the Mauser 98, even though the Gewehr 98 and a copy of the Kar 98 itself is already aliased to it. So I think it should be aliased with the name with and without space (as both were in common usage).