Attempt to create a custom widget under DSM

[DigitalBox98]

Description

Widget creation under DSM is not really documented. This is an attempt to write a simple widget in ExtJS with Syno libs.

Checklist

• Build rule all-supported completed successfully
• New installation of package completed successfully
• Package upgrade completed successfully (Manually install the package again)
• Package [functionality was tested]
• Any needed [documentation]

Type of change

• Bug fix
• New Package
• Package update
• Includes small framework changes
• This change requires a documentation update (e.g. Wiki)

Point to improve :

• Remove the flask dependency which was used by be able to create the package (idea is to have a pure ExtJS javascript package)

Simple widget in action :