Make configurable whether to use HTML editors for message templates (and campaigns)

[AndreiMaz]

We saw that you have removed the TinyMCE editor from the message templates. Maybe you could make this optional (as a setting) as most of the marketing guys/store owners will not be able to manage the templates if they don't have HTML knowledge. We think this could have a really bad impact on nopCommerce if it is hard for marketing people to use it.

Source: http://www.nopcommerce.com/boards/t/46341/nopcommerce-390-beta-released-please-share-your-impressions.aspx?p=7#184397