• Break change sources exluding around, buffer or file are extracted
  as extensions.
• Break change custom source not exists any more.
• Add coc.preferences.preferCompleteThanJumpPlaceholder to make jump
  placeholder behavior as confirm completion when possible.
• Add CocDiagnosticChange autocmd for force statusline update.
• Add onDidUnloadExtension event on extention unload.
• Fix getDiagnosticsInRange, consider all interactive ranges.
• Fix completion throw when data on complete item is string.
• Fix commitCharacters not works.
• Fix workspace methods: renameFile, deleteFile and resolveRoot.
• Fix textEdit of builtin sources not works.