Media monitor updates

[ljoy913]

• Generate smaller thumbnails when c2pa lib returns entire image as thumbnail
• Refactor MediaMonitor to detect media elements in
• Refactor VisibilityMonitor to better detect if an element is visible on a page
• Create a MediaStore to track all media elements on a page
• Create a side-panel, in debug mode, to list all media on the page and list info about its visibility and position
• Add toggle switch to popup to expand/collapse side-panel
• Added utility functions to output element info to the console
• Added additional svg icons for display in the side-panel
• Added code to extract byte data from blob urls. Chrome seemingly does not allow this and so it does not currently work, but I have left the code for further investigation.

Note: To see the side-panel you must build in debug mode and expand the side-panel with the toggle switch in the popup options