Feature/istwcms 4221 ebremner remove ec block

Install with this branch and ensure that no more expand/collapse block appears.

added 19 commits

• fd439b63...fa4f7711 - 17 commits from branch 8.x-1.x
• 51a5ceb6 - ISTWCMS-4221: removing all config for expand/collapse block
• 3b5d283f - ISTWCMS-4221: removing more of the expand/collapse block stuff

Compare with previous version

merged

mentioned in commit 544f4450

Created a new branch: feature/custom-block-expand-collapse for previous code.