[AndyB] Duplicate account check 3.0

Checks for duplicate user accounts.

If two or more valid users have logged into your forum with the same IP and User Agent, they will be flagged as duplicate and the admin will receive an email.

View attachment 26934

(Example of Options page)
View attachment 26935

Features:

• Checks for duplicate IP and User Agent.
• Checks for user_state of 'valid'.
• All phrases start with duplicateaccountcheck_ for your convenience.

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Added check empty condition for superglobal variable.

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Added email address to notification email.

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