sanitizeStreamFilter breaks stream filters with new-line characters in their arguments

[HeyRatFans]

When using appendStreamFilter or prependStreamFilter the name of the filter is sanitised by the sanitizeStreamFilter. This method currently casts the name to a string, trims and returns it.

Trimming the string removes any trailing new-lines or other invisible characters like NULLs or white-space to be removed. This causes problems for filters that expect these characters to be used as arguments. For example a filter that uses str_replace to convert Windows-style line endings (\r\n) to Linux-style (\n) cannot be used because the trailing \n gets removed by the trim call.

This issue affects release 7.1.2 of thephpleague/csv and is known to be present on both PHP 5.6.10 on Ubuntu 14.04 and 5.5.25 on Windows 7.

[nyamsprod]

This issue is resolved in the master branch