Bump DiffEngine and EmptyFiles

[dependabot]

Updated DiffEngine from 20.6.0 to 20.8.1.

Release notes

Sourced from DiffEngine's releases.

20.8.1

• #​953 Give the host-side kill of a WSL tool time to finish

20.8.0

• #​947 Stop treating WSL as a build server
• #​948 Stop the Linux viewer needing libSM and libICE
• #​949 Launch Windows diff tools from inside WSL
• #​950 Rebuild native renderer binaries

20.7.2

• #​942 Squash 2.0.0: keep the DiffEngine namespace for friends

20.7.1

• #​941 Trim with Squash

20.7.0

• #​914 Read PDF, Office and SVG documents in the standalone viewer and the tray
• #​916 Read and draw maps in the standalone viewer and the tray
• #​918 Load pictures off the UI thread with a spinner, and draw documents for the entry on screen only
• #​920 Remember the viewer's window and views, zoom pictures, switch map projections, and copy from a pane's menu
• #​922 Fix the bugs and the performance items from the review: the viewer's model, the library, the inline patcher, the tray and the three heads
• #​932 Close the remaining ways a queued snapshot or file is wrong or misreported, and four Windows head and test items
• #​933 Fold the files derived from a document beneath it in the viewer

20.7.0-beta.1

Commits viewable in compare view.

Updated EmptyFiles from 8.19.0 to 8.20.1.

Release notes

Sourced from EmptyFiles's releases.

8.20.1

• #​250 Trim with Squash

8.20.0

• #​248 Add Map category with empty geospatial files

Commits viewable in compare view.

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