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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chore: Update dependencies (bpmn 18.18.0, dmn 17.8.1)

build: generate vendor bundles locally and clean obsolete assets

fix: Avoid strange visualization (Fixes #62)

feat: Update bpmn and dmn libraries

fix: DMN modeler (#52)

* fix: DMN modeler
* chore: bump version

feat: Update bpmn-js to v18.3.1 dmn-js to v17.1.0 (#47)

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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fix: Cleanup by removing CMMN (#24)

feat: upgraded DMN.iO to v12.2.0

feat: upgrade bpmn-js to version 9.3.1

feat: upgrade bpmn-js to version 6.1.1

#15 added dmn-js library

#16 added cmmn-js library

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