Comma Escaping for MFG_NAME

Added a string replace function from https://github.com/xdissent/monowave-eagle/blob/master/User%20Language%20Programs/Library%20Browser/Process%20Library.ulp.

It is used to escape potential commas in manufacturer names such as "Samsung Electronics, Inc" which was requiring manual cleanup before import to Digikey.

*Note: Digikey does not respect the full CSV spec as they just break on all commas, this means just quoting each field does not work*