Breaking changes

The place for manual language server configurations was moved from LSP.sublime-settings
to a new settings file LanguageServers.sublime-settings, which can be opened from the
command palette and from the main menu. This makes it possible to dynamically change the
"settings" of a language server while it is running. For now the configurations under
"clients" in LSP.sublime-settings still work, but that place is deprecated.
The shipped server configurations from "default_clients" were removed. If you used
one of those, please add the configuration to your user configurations file under
Packages/User/LanguageServers.sublime-settings. Examples can be found on the
documentation website at https://lsp.sublimetext.io/language_servers/.

Features

Add support for workspace/didChangeConfiguration (#2862) (jwortmann)
Add support for VSCode-specific editor.action.showReferences command (#2874) (jwortmann)
Add support for MarkupContent in diagnostic message (#2845) (jwortmann)

Deep copy all ClientConfig properties when copying it (#2861) (Rafał Chłodnicki)
Fix crash on checking for membership (#2857) (Rafał Chłodnicki)
Fix formatting triggering on swapping lines (#2852) (Rafał Chłodnicki)
Mark changes triggered by edits as OTHER for on-type-formatting (#2854) (Rafał Chłodnicki)
Handle unknown diagnostic tags gracefully (#2847) (jwortmann)

Make Goto Diagnostics panel follow show_diagnostics_severity_level (#2856) (jwortmann)
Update style for diagnostic annotations (#2839) (jwortmann)