feat: DMN diagram support (#23)

fix: more cleanup (#22)

* fix: remove unneeded things

* fix: more simplifications

fix: scrollbars and cleanup (#21)

* fix: scrollbars

* fix: Another bunch of cleanup

fix: diagram type added and code cleanup (#20)

fix: improved toolbar icon

feat: upgraded DMN.iO to v12.2.0

feat: added fr,de locales

fix: menu titles

fix: simplified styles and updated screenshot

fix: Repair the automatich scrollbar in a clean way

fix: Igor compatibility

fix: Follow best practices to include js and css onto the page

fix: Adapted script to the new API

feat: upgrade bpmn-js to version 9.3.1

chore: update version

feat: added editor config file

chore: updated license file

feat: upgrade bpmn-js to version 6.1.1

Internal reorganization, version update

#15, #16: Preparing for adding more handlers (dmn, cmmn)

#15 added dmn-js library

#16 added cmmn-js library

#17 updated LICENSE info

#17, put external bpmn-js code inside a vendor folder

Upgraded to bpmn-js 3.0.4