* Add base tests for isVoid with around text node
* Ensure that void nodes are surrounded by text nodes in Node.normalize
* Only wrap inline void nodes with text
* Fix indentation
* Add emojis example
* Adapt unit test "transforms/fixtures/at-current-range/set-inline/with-is-void"
* Adapt unit test "transforms/fixtures/at-current-range/insert-inline/with-inline"
* Adapt unit test "transforms/fixtures/at-current-range/insert-inline/block-start"
* add passing parent to leaf nodes, for rendering breaks
* add zero-width spaces in empty text nodes, to allow selections
* add zero-width space handling to copy/cut
* fix delete handling around inline void nodes
* fix tests for inline void nodes
* fix style
* fix void cursor handling across browsers
* fix void rendering tests
