message: Add comment operator 'gb'.
  This commit make it possbile to use 'gb' to toggle line comments.
diff: @@ -7050,3 +7050,19 @@ class CommandSurroundAddToReplacement extends BaseCommand {
  return false;
  }
  }
  +
  +@RegisterAction
  +export class CommentOperator extends BaseOperator {
  + public keys = ["g", "b"];
  + public modes = [ModeName.Normal, ModeName.Visual, ModeName.VisualLine];
  +
  + public async run(vimState: VimState, start: Position, end: Position): Promise<VimState> {
  + vimState.editor.selection = new vscode.Selection(start.getLineBegin(), end.getLineEnd());
  + await vscode.commands.executeCommand("editor.action.commentLine");
  +
  + vimState.cursorPosition = new Position(start.line, 0);
  + vimState.currentMode = ModeName.Normal;
  +
  + return vimState;
  + }
  +}
  \ No newline at end of file
  