support HTML in msg.payload of ui-text.

[m-schaeffler]

Description

I sometimes use HTML in the format property of dashboard 1.0 ui-text.

As this is no longer available, I tried to use HTML in msg.payload instead.
This HTML code is not executed but just written out:

It's clear that this is due to injection attacks. Would it be possible to have a switch in the ui-text to allow HTML in the mag.payload?

Have you provided an initial effort estimate for this issue?

I am no FlowFuse team member

[colin-grierson]

This is similar to #615 "Markdown-UI & Template-UI node do not process HTML\Markdown sent to it by NR Template node"