TagField hydrates the entire result set because a parent class calls `toArray()` on the $source.
This fix changes the source to an empty array, so no such manipulation can be made.
* Added parameter to SilverStripe\TagFieldTagField::__construct()
* Modified SilverStripe\TagFieldTagField::getOptions() to use assigned title field
* Modified SilverStripe\TagFieldTagField::getValue() to use assigned title field
* updated the CSS of the tag field to match with
the dropdown fields / list fields
* resolve with of the field to the style attr of
dropdown
* added style width
* removed the empty lines
* changed to the correct classname readonly tag field
* fixed the tag field signature
* removed the whitespace ending in line 352
As jQuery is bundled in the frameworks vendor.js having
these calls causes a duplicate of the jQuery library
This also means plugins link with the wrong library etc.
Noticed with `jQuery.dialog()` from a Page edit screen
going to an associated DataObject edit screen
* Update composer constraint and branch alias to support SS4 testing
* Add namespaces, update DataList quirk with getSourceList
* Add PSR-4 autoloader definition
* Move template to correct namespace location, update requirement paths
* FIX Visibility on allowed actions
* FIX Update chosen class names to match updates in framework
* Update Travis configuration for 4.x builds. Update docs for namespaced classes.
* Use "4" for the release instead of master.
* FIX Selected tag height. Move Readonly to own class.
