* removed all the generated files (<locale>.json, <locale>.js) except for ‘en’ versions and added them to git ignore.
* updated cleanup.sh to use our messages.
* added validation check to fail if any translations include newlines
* skip generating js files other than ‘en’ as we don’t use them
* Revised messages.js to use _single_ quoted strings instead of double (consistent with Blockly - if we need to import more strings), and switch the validations to check for single not double quotes.
* additional small changes for simplicity and ergonomics
Not handling category menu at this time as it’s managed differently in scratch-gui.
* WIP merge from upstream google/blockly
* fixing some merging bugs. Getting the drag surface to work, updating some function calls, etc.
* make the trash can lid animate again and fix the cursor to show an x when things will be removed.
* Fix text rendering logic in fields
* Hand apply some more changes from blockly flyout.js to flyout_base.js.
Also revert 08efd1381c
in scratch-blocks since it breaks variables and there is more work fenichel is planning
to do here.
* Fix drop-down field rendering
* Resolve issue with text input field widths on init
* Remove unused blockly (built) files
* Remove unused language files
* Resolve lint issues and rebuild
* Add blockly build targets to cleanup script
* Return 0 if 'this.arrow_' does not exist in a dropdown field
* Remove unused / irrelevant comments
