Merge pull request #42 from extremeCrazyCoder/dev

hotfix of api

removed debugging output

Changed postinstall script to prepare stage --> same can be used for deployment and for development

Moved zoom plugin from normal plugin selection into core plugin section

Transparent color is now also availaible after selecting the right tool

remove keydown event context to make key events work

use small JSON output for saving (instead of beautiful output)

Add missing event to Fix #38

Fixed scrolling bugs

Fixed #33

Update libs of examples to Bootsrap v4.3.1 and jquery-3.4.1

Fix #25 for one and double sided arrows

Fix typo in redactor.less

updated dist, updated package.json