More in here than I'd like in one commit, but it was one of those
sets of cascading changes.

The Filter path for invoking obfuscation was much more mature than the
twig path or the field formatter. Move that code into a trait and start
using it for all paths. Tidy up obfuscateEmail so it really handles an
email (potentially with a related piece of text and additional attributes
if it is part of a link. Put additional attributes into data attributes.
Tidy up interfaces between routines. Remove jQuery dependency. Fix not
matching across new lines.

Signed-off-by: Nigel Cunningham <nigel@technocrat.com.au>

Signed-off-by: Nigel Cunningham <nigel@nigelcunningham.com.au>

Issue #2974138 by shadowphiar: filter/tips page broken when obfuscate is enabled as a filter, fix coding standards

Add factory, configuration form, Twig extension, permission. Modify service. Update readme. Scaffold browser test, ROT13, text Filter.

Refactor by defining ObfuscateMailBasic as a service that implements ObfuscateMailInterface, review readme