This commit ensures we correctly detect and import
Data*Associations and Associations.
It aligns logging across the import components, too, being slightly more
verbose and helpful.
Related to #112
This commit puts all import related stuff into the import module.
The core module remains as an entry point to require the basic modules
needed by bpmn-js. At the time this is { import, draw }.
This enables users to instantiate Viewers/Modelers via
```
new Viewer({
additionalModules: [ ... ]
});
```
to bootstrap their own modules with the viewer without overriding the
existing ones.
This commit ensures we pipe invisible root elements (Process,
Collaboration) through our import infrastructure, too.
This way we we receive proper events for them.
Related to #6
This commit extracts the main import logic found in import/Importer into
the core/BpmnImporter module. By doing so we we are able to reuse it
during modeling.
Related to #6
Instead of failing hard when we parse invalid flow elements (i.e.
TextAnnotation) we log a warning that may be handled by the diagram
import.
Related to #74
This commit upgrades the code base to the latest diagram-js changes and
adds a component called BpmnRegistry that can be used to retrieve a
certain BPMN/DI element from a shape/connection id.
Related to #19
