Old rules deprecation

[Noci]

Feedback on New Rule interface...
Looks nice, needs a bit of getting acquainted i guess.

Two issues that could be handled better.
1) During export old, import new there was one error: interface lo0..? rule.  I deleted that one as i see no reason for a rule filtering traffic on lo0.  appearently it doesn't exist in 26.1 anymore. 

2) There is an error either in export or import  of rules with html encoding.  allrules having special signs like > are different.
Allow Float -> ICMP out      changed into    Allow Float -> ICMP out
If exporting uses HTML safe data, then import should as well.

https://github.com/opnsense/core/issues/9694