v1.0.14.2: Ability to save drawings

Ability to save drawings (#44)

• Added toolbox to the common methods.
• toolbox.save_drawings_under can save drawings under a specific topbar widget. eg chart.toolbox.save_drawings_under(chart.topbar[’symbol’])
• toolbox.load_drawings will load and display drawings stored under the tag/string given.
• toolbox.export_drawings will export all currently saved drawings to the given file path.
• toolbox.import_drawings will import the drawings stored at the given file path.

Fixes/Enhancements:

• update methods are no longer case sensitive. (#46)
• HorizontalLine no longer throws cyclic structure errors in the web console.
• API methods can now be normal methods or coroutines.