Break out EditorPara plugin for IE and other browsers

Break out EditorPara plugin for IE and other browsers

Fixes #2531299 - Added e.preventDefault() call to all backspace keystrokes in Webkit to prevent frame navigation.

Fixes #2531329 - Rename Y.Selection to Y.EditorSelection

Ref #2530938 - Better bidi handling

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Fixes #2530527 - _fixFirstPara was not being triggered properly to catch this use case.

API doc updates

API doc updates

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Small patch for FF and cursor focus on an empty document

Moved all Para logic to EditorPara, removed the autoplug of EditorPara, created an EditorBR plugin to do the opposite of EditorPara. Either can be used, but not both. They will throw an error if both are plugged into an instance.

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Removed a console.log

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Fixed an issue with firefox and an anomoly with the delete key and paragraphs

Fixed an issue with firefox and an anomoly with the delete key and paragraphs

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Broke out EditorBidi into EditorBidi and EditorPara (the latter autocorrects paragraphs)