Changes with Aloha.Editor 1.4.42

Enhancement SUP-5804

block-plugin: Block implementations can now implement the method confirmedDestroy(), which allows to add a confirmation
before a block is deleted via the keyboard.

Bugfix SUP-5798

When the “Remove link” button was clicked while two consecutive links were selected, only the first one was actually removed. This behaviour has been changed, so that all links in the current selection are removed.

Bugfix SUP-5765

When pasting markup containing block level elements (like paragraphs or headers) into
an editable, that does not allow block level elements, AlohaEditor unwrapped the contents,
which resulted in consecutive text blocks (without visible line break).
This has been fixed now, so that after each unwrapped block level element a
tag will be inserted to
retain the line breaks.