DM-9430 Fix Compass Layout

[cwang2016]

the development includes

• Locate the compass at the left corner of the image when the image is scrolled, zoomed, re-centered, rotated, flipped, etc.

test:

• find a image by using 'Images' panel.
• click 'compass' button from the image tool bar
• apply image processing related buttons and see how the compass is rendered.

[robyww]

Code looks good and it works very well. Using a saga was a good idea.

I would like you do to one thing:

For fits files without a coordinate systems the compass need to be a noop with out exceptions. I am not sure what happened before but it was probably a problem. I will send you a fits file from the LSST camera team that you can test with.

[ymeiymei]

Tested with both LSST and WISE images. After the compasses are added to the images, zooming, moving, rotating, flipping....the images, the compasses keep staying in the images. Good work!