Add "mirror_canvas_around_canvas" action
Add a new mirror action that rotates around the canvas.
We have two mirror options that are not always ideal, mainly when painting zoomed out. When using the default mirror if the canvas it not centered, it's almost like watching a tennis match :p The canvas around the cursor is ok when zoomed in, not always great when zoomed out and it depends on the user moving the cursor before mirroring.
The action has no set shortcut. I figure it's probably best to let the user decide what to set or replace. The icon is the same as the normal mirror. Not sure if this needs a new icon or what it should be.
Test Plan
Either set a new shortcut to "Mirror View Around Canvas" or invoke the action at "View->Canvas->Mirror View Around Canvas".
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