[vim bindings] Make C-q an alias for C-v

Closes codemirror#3806

Author: marijnh

keymap/vim.js

@@ -164,6 +164,7 @@
     { keys: 'v', type: 'action', action: 'toggleVisualMode' },
     { keys: 'V', type: 'action', action: 'toggleVisualMode', actionArgs: { linewise: true }},
     { keys: '<C-v>', type: 'action', action: 'toggleVisualMode', actionArgs: { blockwise: true }},
+    { keys: '<C-q>', type: 'action', action: 'toggleVisualMode', actionArgs: { blockwise: true }},
     { keys: 'gv', type: 'action', action: 'reselectLastSelection' },
     { keys: 'J', type: 'action', action: 'joinLines', isEdit: true },
     { keys: 'p', type: 'action', action: 'paste', isEdit: true, actionArgs: { after: true, isEdit: true }},