* Add a for each structure event
* Apply review instructions to newIDE
* Fix naming in code generator
* Rename ForEachStructure
--> ForEachChildVariable
* Rename Structure and Variable
--> IterableVariableName and IteratorVariableName
* Delete old file
* Fix flow typing
* Remove unecessary includes
* Add key iterator, make iterators optional
* Clean up ForEachChildVariableEvent.js
* Add method on gdjs.Variable to replace children
* Add word warp to the event label