Use VSCode native block cursor setting

[ThatRendle]

Adding this as a place-holder because there should be a new release of VSCode this weekend which provides a block cursor style out of the box.

[jpoon]

👯

microsoft/vscode#561

[jpoon]

@markrendle I saw that the PR got merged but how does one use it and toggle between the different cursor styles?

[tma-isbx]

This sample project has the details: https://github.com/alexandrudima/vscode-vim