* Added Max Instances property to Blocks
* eslint cleanup
* eslint cleanup 2
* Moved maxInstances property from block to workspace (as a map of block type to max instances). isDuplicate() changed to correctly handle siblings/branches.
* eslint cleanup
* Changed checking types to map. Added hasBlockLimits. Fixed Nits.
* Added limit_instances test block. eslint fixes.
* fixup! Added limit_instances test block. eslint fixes.
* Changed sorting objects to a private static function of the workspace. Fixed nits. Undeleted .eslintrc
* Reverted .gitignore file.
* Added getBlockTypeCounts() to utils. Added isCapacityAvailable() to workspace. Changed clipboard to save typeCountsMap rather than object.