Merge pull request #105 from oerpub/59192250-dont-add-ids-to-titles

remove ids from default block titles
make semantic draggables look more like mock-up

Lighten look of buttons / make them more like in mock-ups. Goes with
related change in github-bookeditor.
Merge pull request #107 from oerpub/style-semantics-like-mockup-58860600

make semantic draggables look more like mock-up
Merge pull request #104 from oerpub/59363000-make-empty-headings-work-correctly

workaround to make empty headings work properly
Merge pull request #106 from oerpub/59098512-put-tables-into-a-semantic-block-so-that-they-can-be-copied-moved-and-deleted

59098512 put tables into a semantic block so that they can be copied moved and deleted
fix bug in semantic block activation
On delete, renumber tables from the topmost editor down.
renumberCaptions takes a jquery of matched tables now.
When semantic block is deleted, trigger an event.

This allows other plugins to react to a delete.
When a semantic block with table is deleted, renumber.
Merge branch 'fix-table-renumbering' into testing