There is significant confusion in names and comments with regards to variables and procedures. `Blockly.Generator.prototype.variableDB_` is a Blockly.Names database, not a variable map. This rename introduces a getter and setter so deprecated references still work. This commit also fixes some comments which are either outright wrong or misleading regarding variable and procedure names.
* 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.
