Start using TextEditorPresenter in LinesComponent

Removed shouldComponentUpdate because we will always update the
component manually once this is done, but I don’t want to accidentally
prevent the component from updating during the conversion process.

This commit has a failing spec due to the presenter not accounting for
individual character widths.

src/text-editor-component.coffee

@@ -720,6 +720,7 @@ TextEditorComponent = React.createClass
 
   onScrollTopChanged: ->
     @scrollingVertically = true
+    @presenter?.setScrollTop(@props.editor.getScrollTop())
     @requestUpdate()
     @onStoppedScrollingAfterDelay ?= debounce(@onStoppedScrolling, 200)
     @onStoppedScrollingAfterDelay()