Allow individual line descriptions on alias bulk import

This enhancement allows the user to make a text file of IP addresses, IP subnets and/or IP ranges, like they have always been able to do, but with this they can put a description after each IP number and that description text will be saved in the alias. All existing functionality without specifying a description is unchanged, so it is backward-compatible.
This is handy when having aliases that are on all my pfSense boxes, I can make 1 text file, bulk import it on every system and now include descriptions of each chunk of IP address space.
Note: The artificial limit of 200 character descriptions is to catch the case where a user pastes a long list or IP addresses, but they are all on 1 line. An error message is given, rather than importing the 1st IP and considered the remaining ones as the description.
Merge pull request #877 from phil-davis/master

Allow individual line descriptions on alias bulk import