Target specific palette

Use relative path to load extension assets

Append sprite name to monitor label for sprite-specific monitors.

Update react-responsive to the latest version 

Update react-test-renderer to the latest version 

Fix waveform in sound editor in Firefox

Register music extension assets

Update react to the latest version 

Update react-dom to the latest version 

Update enzyme-adapter-react-16 to the latest version 

Update react-tabs to the latest version 

Warn user before navigating away/unloading

Refresh workspace with sprite-specific blocks when sprite changes

Prevent deleting a sound from exploding

chore(package): update eslint-plugin-react to version 7.5.1

firefox doesn't like comma (,) in svg path, so I change comma to space