link 7.x-1.3

Issue #0 by jcfiala: Various small fixes to pass coder review.
Issue #2351223: Improve field validation error message by Xano: Improve field validation error message.
Issue #2350253: Link with ! (exclamation) in URL query returns "not a valid URL" by genjohnson: Fixed Link with ! (exclamation) in URL query returns "not a valid URL".
Issue #1483494: Notice: Undefined index: url in _link_process() (line 345 of ../link.module). by vinmassaro, cord1: Notice: Undefined index: url in _link_process() (line 345 of ../link.module).
Issue #1955976: Allow relative paths with validation by chOP, erikhopp, idebr, d.clarke | Jim Cutler: Added Allow relative paths with validation.
Issue #2117099: Expose attributes as property info by tim.plunkett: Expose attributes as property info.
Issue #1930430: Migration integration misses title attribute for mutiple-valued link fields by benjifisher: Fixed Migration integration misses title attribute for mutiple-valued link fields.
Issue #97766: Class attribute field option for each dataset in link widget by tanepiper, heddn, timbrandin, droath, alanburke, Digidog: Class attribute field option for each dataset in link widget.
Issue #1266474: Use field label as the label for the title field by redndahead, franz, RobLoach, jcfiala, markabur: Use field label as the label for the title field
Issue #2036645: Issue when a URL is a query string parameter, e.g. EZproxy links, Zanox tracking links etc. by lex0r: restricting the explode to 2 items when breaking apart querystrings helps prevent problems with unescaped = characters in the data.
Issue #2223571: Support for new TLD's by jcfiala: Included new tld that had been included into the 6.x-2.x branch.
Issue #2223571: Support for new TLD's by jcfiala:Back-ported configurable domain support from 7.x-1.x version, added more tlds to default list.
Issue #1836632: Double HTML escaping when using plain_title formatter by jcfiala:Removed double-encoding of titles when url not specified in link field.
Issue #1980736: theme_link_field() only renders elements defined by this module by Cottser: Allow child elements of the link field to be rendered.