Introduce annotations (#2747)

* first stab at removing leaves with tests passing

* fixes

* add iterables to the element interface

* use iterables in more places

* update examples to use iterables

* update naming

* fix tests

* convert more key-based logic to paths

* add range support to iterables

* refactor many methods to use iterables, deprecate cruft

* clean up existing iterables

* more cleanup

* more cleaning

* fix word count example

* work

* split decoration and annotations

* update examples for `renderNode` useage

* deprecate old DOM-based helpers, update examples

* make formats first class, refactor leaf rendering

* fix examples, fix isAtomic checking

* deprecate leaf model

* convert Text and Leaf to functional components

* fix lint and tests

packages/slate-hyperscript/test/index.js

@@ -9,21 +9,4 @@ describe('slate-hyperscript', () => {
     const expected = Value.isValue(output) ? output.toJSON() : output
     assert.deepEqual(actual, expected)
   })
-
-  fixtures.skip(__dirname, 'decorations', ({ module }) => {
-    const { input, output, expectDecorations } = module
-    const actual = input.toJSON()
-    const expected = Value.isValue(output) ? output.toJSON() : output
-    assert.deepEqual(actual, expected)
-
-    expectDecorations.forEach((decoration, i) => {
-      Object.keys(decoration).forEach(prop => {
-        assert.deepEqual(
-          decoration[prop],
-          input.decorations.toJS()[i][prop],
-          `decoration ${i} had incorrect prop: ${prop}`
-        )
-      })
-    })
-  })
 })