Bump DiffEngine from 20.3.1 to 20.5.0

[dependabot]

Updated DiffEngine from 20.3.1 to 20.5.0.

Release notes

Sourced from DiffEngine's releases.

20.5.0

• #​877 Bump EmptyFiles to 8.19.0
• #​884 Cut per frame, per verification and per scan work found in the review
• #​885 Make the Linux viewer draw frames, read input and wait between them
• #​887 Hold a group's deletes until its snapshots are written, from an attached viewer
• #​889 Fix the viewer model items from the review
• #​891 Fix the tray items from the review
• #​893 Fix the native items from the review
• #​894 Fix the library and inline items from the review
• #​896 Paint Windows image panes from a cached composite, and decode off the UI thread
• #​898 Redraw the macOS window only when something changed, and cache scaled pictures
• #​901 Put every character on the cell grid, so selection agrees with what is drawn
• #​902 Keep the macOS viewer out of App Nap while it runs

20.4.0

• #​871 Open viewer entries at their first change and add a changes only view
• #​873 Answer the viewer's port while its render thread is busy
• #​874 Show how far accept all has got
• #​875 Observe a connect given up on
• #​876 Add DiffRunner.SettleDelete to withdraw a pending delete

Commits viewable in compare view.

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