* Add getSelected/setSelected to core/common.js
* Migrate core to use Blockly.common.getSelected/setSelected instead of Blockly.selected
* Migrate demos to use Blockly.common.getSelected/setSelected instead of Blockly.selected
* Remove Blockly.selected
* Use variable instead of calling common.getSelected() multiple times
* Add accessor for selected on Blockly
* Add renaming record for Blockly.selected -> Blockly.common.getSelected/setSelected
* Add hideChaff() to core/workspace_svg.js
* Mark Blockly.hideChaff as deprecated
* Update uses of Blockly.hideChaff() to WorkspaceSvg.hideChaff() in core
* Update uses of Blockly.hideChaff() to WorkspaceSvg.hideChaff() in demos
* Style and formatting fixes
* Switch from accessor to stub wrapper for Blockly.hideChaff
Co-authored-by: Christopher Allen <cpcallen+github@gmail.com>
Co-authored-by: Christopher Allen <cpcallen+github@gmail.com>