[AndyB] User Agent 2.8

There are several reasons why this add-on can be very helpful:

1. Knowing trends like the type of devices being used.
2. Knowing a members device is helpful in troubleshooting situations.

(Example of User agent link in Visitor tab)
View attachment 9815

(Example of User agent page)
View attachment 9816


(Example of Options page)
View attachment 9817

(Example of User group permission)
View attachment 9818...

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• Added "Show user agent information" to options page.

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Fixed issue with intermittent deadlock.

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Added check empty condition for superglobal variable.

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