* Remove the entire SQL template system
* Secuirty issues arose that can't easily be fixed in MPOS
* For the sake of site security, these have been completely removed
! Will require the `templates/cache/bootstrap` and `template/compile/bootstrap`
folders to be removed if custom SQL templates were used !
Will fix#2114 once merged.
* Added throttle option to swiftmailer for SMTP limiting
* Added newsletter page for admin panel
* Added newsletter mail template (simple one for now)
* Added new global configuration option
* Added default notification setting system in notification class
* Added global pool newsletter enable/disable switch in admin settings
Fixes#2087 once merged.
