diffdir: Move into dgtools #63

Job	Run time
Create Release	6s
Tool (ubuntu-latest, cli-bookmarks)	11s
Tool (ubuntu-latest, cssh/cscp)	11s
Tool (ubuntu-latest, ffind)	14s
Tool (ubuntu-latest, cssh/cssh)	14s
Tool (ubuntu-latest, csvtable/cmd/csvtable)	10s
Tool (ubuntu-latest, grepp)	11s
Tool (ubuntu-latest, joinlines)	11s
Tool (ubuntu-latest, yaml-parse)	11s
Tool (ubuntu-latest, password-cache/cmd/password-cache)	11s
Tool (macos-latest, cssh/cscp)	17s
Tool (macos-latest, cssh/cssh)	27s
Tool (macos-latest, csvtable/cmd/csvtable)	20s
Tool (macos-latest, grepp)	20s
Tool (macos-latest, joinlines)	31s
Tool (macos-latest, yaml-parse)	18s
Tool (macos-latest, password-cache/cmd/password-cache)	19s
	4m 22s

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