Add custom terminal profile

[dagolinuxoid]

Let's say I want to use a custom 'Nord' theme for the elementary terminal. How to achieve it? At the moment the terminal has three radio buttons: high contrast, solarized light, dark. Clicking on corresponding button changes only foreground and background to some default defined value for each button. Right now I can define a theme

#!/bin/bash

# Nord_ISH theme
# palette="#3b4252:#bf616a:#a3be8c:#ebcb8b:#81a1c1:#b48ead:#88c0d0:#e5e9f0:#4c566a:#bf616a:#a3be8c:#ebcb8b:#81a1c1:#b48ead:#8fbcbb:#eceff4"
foreground="#eceff4"
background="rgba(46, 52, 64, 0.95)"

gsettings set io.elementary.terminal.settings foreground "$foreground"
gsettings set io.elementary.terminal.settings background "$background"
gsettings set io.elementary.terminal.settings palette "$palette"

and run such ./setMyTheme.sh to change palette permanently. The problem is as soon as I click on the radio buttons they dispatch setting of some default background and foreground settings overriding the ones described in a custom theme. Actually I think it's a good thing. The question is how can I change the default values for only dark radio button to values of my custom defined colors for foreground and background to make it permanent?
The other solution would be to consider adding a new theme (fourth, fifth ... radio button with a custom name something similar to gnome-terminal profiles feature). But I'm a bit skeptical about the approach: three buttons is more than enough.

[jeremypw]

See #418

[danirabbit]

I believe this is now fixed. Custom theme settings now can be selected in the UI and persist even when switching between default themes