[AndyB] Disallowed extensions 1.0

Disallows selected attachment file extensions in posts.

This add-on is useful if you allow video attachments. By default XenForo allows all video types. So for example if you only want to allow MP4 videos then you can disallow the other video types.

(Example of Options page)
View attachment 61954(Example when user uploads disallowed extension)
View attachment 61955


Features:
All phrases start with disallowedextensions_...

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