Use number formatter for all numbers in search dialog
Simplify test preparation code
Move boost crc include to PCH

Also use unsigned integer for the checksum.
Saved window frame was wrong if file browser didn’t adjust width
Don’t assume our divider is an NSImageView
When creating a label, don’t allow providing what class to use

Also change return type from NSImage* to NSView* when creating divider image.
Support images with alpha in OakBackgroundFillView
Use OakBackgroundFillView for our divider image

This is both simpler and more future proof since using an NSImageView requires a cell subclass to disable accessibility (voice over), and cells are deprecated.
Use a real content checksum when doing folder searching
Verify checksum when replacing in non-open documents

If the checksum does not match we simply skip the document and does not show the replacement as having been done (in the UI).
Add test for wrong checksum passed to document::replace