feat: Lint setting and defaults

feat: add bpmnlint integration for BPMN diagrams

Surface model validation issues directly in rendered diagrams and in the
editor via bpmn-js-bpmnlint. A toggle button on the canvas shows clickable
e

feat: add bpmnlint integration for BPMN diagrams

Surface model validation issues directly in rendered diagrams and in the
editor via bpmn-js-bpmnlint. A toggle button on the canvas shows clickable
error/warning overlays on the offending elements.

- New `lint` attribute on <bpmnio>: on | off | inactive. The viewer defaults
to button-present-inactive; the editor defaults to active.
- Rules live in .bpmnlintrc (extends bpmnlint:recommended) and are packed into
the committed bundles at build time via bpmnlint-pack-config, since bpmnlint
cannot resolve rules in the browser. build:vendor handles this automatically.
- The lint module runs in a plain Viewer (every injected service is present;
editorActions resolves optionally), so no viewer upgrade was needed.
- Add syntax tests for the lint attribute; default output is unchanged when the
attribute is absent.

Refs #83

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feat: Implement Links

fix: Unbalanced divs and strengthen error validation

feat: Zoom option

fix: Size of dmn diagram after add or edit

fix: Shapes cut (#61)

feat: Make use of media file via src (#58)

fix: DMN modeler (#52)

* fix: DMN modeler
* chore: bump version

fix: handle non ascii chars properly (#48)

* fix: handle non ascii chars properly

* fix: use modern alternative to escape

feat: upgrade bpmn-js and dmn-js (#35)

* feat: Added dmn modeler code

* feat: Upgrade bpmnio-js to v12.0.0

* doc: add info about DMN

* feat: Upgrade DMN to v14.1.1

* fix: Make dmn appear

feat: upgrade bpmn-js and dmn-js (#35)

* feat: Added dmn modeler code

* feat: Upgrade bpmnio-js to v12.0.0

* doc: add info about DMN

* feat: Upgrade DMN to v14.1.1

* fix: Make dmn appear in the editor page

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feat: Integrate the BPMN editor (#32)

fix: Code cleanup (#31)

fix: Renamed `add` action to `toolbar`, introduced edit support (#28)

fix: renamed add to toolbar, added edit sections

feat: basic built-in editor support

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: Repair the automatich scrollbar in a clean way

fix: Igor compatibility

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