[FEATURE] Image widget update functionality

[Lissy93]

Category: Feature

Overview

• Adds update functionality to Image widget
  • Now the updateInterval option works, for automatic periodic updates, and the "Refresh" button also works
• Improves update functionality for iframe widget too
• Also adds an option to specify image dimensions for Image widget

Issue Number #992

New Vars N/A

Screenshot
Here's an example, for demonstration purposes, we're using imagePath: https://loremflickr.com/640/360 to show a new cat pic on each update 😺

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• Bumps version, if new feature added

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