Provide canvas zoom information to canvas applets

[marktaipan-cvisionai]

Category
Bugfix

Problem
Canvas applets do not have information about whether or not the current canvas is zoomed in. It assumes it isn't. This is problematic for applets that patch/post localization shape and position information.

Request

• Pass in current zoom information so that applets can make the appropriate scaling adjustments when patching/posting localization shape information
• Also pass in the unzoomed image blob so that applets can make use of it still

[bctcvai]

Probably more of a applet fix, than any platform changes

[bctcvai]

verify canvas pointer gets passed to canvas applet