Add disable smarty option

Merged Rich requested to merge artfulrobot/emailapi:artfulrobot-add-disable-smarty-switch into master

This adds an option to disable smarty for the particular email.

This feature was also added to the core MessageTemplate.send API.

My primary motivation is to support nice HTML emails made by Mosaico and turned into message templates by Mosaico Message Templates extension. Mosaico uses a lot of {} and smarty doesn't like that.

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