pull string/cord

BUR #61135 is pending approval.

create alias pull_string -> pull_cord

Both wikis explain the same thing.

BUR #61136 is pending approval.

create alias ripcord -> pull_cord

All except one posts are for chainsaw. Functionally this is the same as pull cord. The only exception is post #7049821 which is just a string to pull the beyblade (object) which I don't think is in the same class as the other pull string/cord.