RegExp support for Blocking Remote Content

[ZR]

Currently we can block or allow specific domains.

The problem with this is that many email services use the same domain for the actual images and for that 1x1 pixel image that they use for tracking views.
This means that currently we can't allow images in emails without also being tracked.

It's also inconvenient to handle websites that have a huge number of sub-domains, each of which has to be allowed or blocked individually.
For example the sub-domains under .s3.amazonaws.com are used for storing real images,
while the sub-domains under .execute-api.us-east-1.amazonaws.com are almost always used for tracking.

If we were allowed to use RegExp for blocking remote content all of this would be solved.

Since RegExp could have conflicts with domain names there would have to be an option in settings to choose if we want to enter a domain name or a RegExp rule.

[Jon]

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