* Added field value tests.
* Fixed field image src param.
* Fixed falsy values with label fields.
* Fixed falsy values with text input fields.
* Fixed some angle field tests.
* Fixed other text input when editing tests.
* Fixed colour tests.
* Cleaned up some number and variable field tests.
* Added angle field > 360 degrees tests.
* Fixed variable validator tests.
* Split setValue tests into sub-suites.
* Fixed angle >360 tests
* Changed var declarations to property declarations.
* Propagate the visible state when blocks connect
This fixes#1967.
In rendered connections when connecting:
- If the superior connection is hidden this hides the newly connected block.
- If the superior connection isn't hidden it makes sure the block is visible.
In rendered connections when disconnecting:
- If the superior connection is hidden, make the disconnected block stack visible.
TODO before review:
- write tests.
- update collapsed message
* Add missing overrides
* Add tests for hidden connections and fix a bug while disposing
