* Refactor block type cleanup into shared cleanup.
* Use shared cleanup for block type cleanup.
* Remove overwriting of core Blockly block in test.
* Rename cleanup arrays for clarity
* Add blocks to cleanup array when defined in shared helpers
* Refactor logic for adding to shared cleanup.
* Add helper for defining block and adding block type to cleanup.
* Fix jsdocs
* Simplifying helpers for adding to cleanup.
* Add missing semicolons
* Update jsdoc for sharedTestSetup
* Use stub to wrap cleanup with defineBlocksWithJsonArray
* Remove unused helper from lint ignore
* Google changed from an Inc to an LLC.
This happened back in 2017 but we didn’t notice. Officially we should update files from Inc to LLC when they are changed as part of regular edits, but this is a nightmare to remember for the next decade.
* Remove project description/titles from licenses
This is no longer part of Google’s header requirements. Our existing descriptions were useless (“Visual Blocks Editor”) or grossly obselete (“Visual Blocks Language”).
* License no longer requires URL.
* Fix license regexps.
* Moved comment icons to use a model-based system. The block holds the model of the comment, and the comment icon holds a reference to it.
* Reorganized the setVisible function.
* Changed how xml.js serializes and deserializes comments.
