Changes with Aloha.Editor 1.4.31

Enhancement SUP-4600

Block-Plugin: event is triggered when a draggable block is dropped.

Bugfix SUP-3131

paste-plugin: When pasting content from Word to Edge, the paste plugin failed to detect and transform
Word specific formatting due to missing classes. The wordcontenthandler is now modified to always treat content
as if coming from Word when used in Edge.