Add cursors based on selection/position

[drewnoakes]

Really excited to try this extension out. Thanks for creating this.

IntelliJ has a great multi-cursor feature where you position the caret somewhere, then press Ctrl+Alt+Shift+J and all instances of the symbol under the caret are selected.

For example:

if (a)
  doA();
if (b)
  doB();
if (c)
  doC();

Put the caret on one of the ifs, then press a shortcut to select all ifs.

I know MultiEdit doesn't currently support multiple selections, but just inserting multiple carets would be a great start.