Updated code and simplified setup of each Helper

- Ensure both `Wysiwyg.Wysiwyg` and standalone helpers work fine
- Simplify the setup of settings for individual helpers. Now all the helpers work in the same way, by passing extra settings in the helper configuration or just as the third argument in the helper call
- Fixed random bugs
- Extracted helper base code into the WysiwygAppHelper class
minor changes to editor options
Update readme documentation