Replaced cache.menu by cache.data in menu_block.services.yml
Added missing menu link definition such that a link appears on /admin/config
Fixed ->getStorageController to ->getStorage() and renamed containing members
Fixed warnings in validate methods of MenuBlock.php
Fixed notice caused by attaching of system ui.button library
Fixed attaching order and library name of jquery ui button lib, fix selector of radios in menu_block.js
Fixed CSS for the form display options
Changes further selectors for styling of display options in JS and CSS
Merge remote-tracking branch 'mb_github/8.x-2.x' into 8.x-2.x
Merge pull request #4 from majistrate/8.x-2.x

Improvements for block configuration form