* unclaim ID of deleted shapes and connections
* unclaim ID of referenced processes when deleting participant
* this does NOT ensure we unclaim IDs of elements like DI, events, errors, ...
Related to camunda/camunda-modeler#1503
Related to #608
* use ES6 import / export
* UTILS: export individual utilities
* TESTS: localize TestHelper includes
BREAKING CHANGE:
* all utilities export independent functions
* library sources got ported to ES6. You must now use
a ES module bundler such as Browserify + babelify or
Webpack to consume this library (or parts of it).