Allow access to img info via api

[doobox]

Scenario:

PLIST:

Image Control - id = myimage

POSS ACCESSABLE VALUES:

%id=myimage -width%
%id=myimage -height%
%id=myimage -size%
%id=myimage -sizeOnDisk%

Sizes returned should ideally be the sizes that will be seen in the exported image, after any image processing done by the plugin, not those of the original image.

Though.....

%id=myimage -widthOrigonal%
%id=myimage -heightOrigonal%
%id=myimage -sizeOrigonal%
%id=myimage -sizeOnDiskOrigonal%

would be a bonus.