message: Make <C-q> activate visual-block mode
  Fixes
diff: @@ -2868,7 +2868,7 @@ class CommandSelectPreviousLastSearchWord extends BaseCommand {
  @RegisterAction
  class CommandVisualBlockMode extends BaseCommand {
  modes = [ModeName.Normal, ModeName.Visual, ModeName.VisualLine];
  - keys = ['<C-v>'];
  + keys = [['<C-v>'], ['<C-q>']];
  public async exec(position: Position, vimState: VimState): Promise<VimState> {
  await vimState.setCurrentMode(ModeName.VisualBlock);
  @@ -2880,7 +2880,7 @@ class CommandVisualBlockMode extends BaseCommand {
  @RegisterAction
  class CommandExitVisualBlockMode extends BaseCommand {
  modes = [ModeName.VisualBlock];
  - keys = ['<C-v>'];
  + keys = [['<C-v>'], ['<C-q>']];
  public async exec(position: Position, vimState: VimState): Promise<VimState> {
  await vimState.setCurrentMode(ModeName.Normal);
  