Changelog #9

#2887 auto import assist.

#2883 enable semantic highlighting inside macros.

#2899 detect popular macro-based test frameworks for the purposes of the "Run …​" lenses/keybinding.

#2901 cancel pending requests when shutdown is initiated.

#2907 inline variable does not remove unused variables.

#2906 fix a bug on windows where main loop was starved by background tasks.

#2893 add a guided tour of lossless syntax trees to the dev docs.

#2891 remove code duplication in validation.

#2898 cleanup cargo watch state management.