Release rescached v4.2.0 (2022-02-09)

===  New features

*  www: implement functionality to remove cache by record name

===  Bug fixes

*  www: check for possible null on NameServers environment
*  www: fix caches record type showing "undefined"

===  Chores

*  all: fix format of all asciidoc files
*  cmd/rescached: add command "embed" and to run in development mode
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