Add JoinMarket settings to settings screen

[dergigi]

Follow-up to and extension of #12

See the Configuration page in the wiki.

Update from Figma, June 2022:

[dergigi]

See also #101

[theborakompanioni]

We should keep in mind that config changes are currently only "in memory": JoinMarket-Org/joinmarket-clientserver#1104

[abhiShandy]

There are too many settings, so it can intimidate users. Let's decide on the selected few settings to show and then we can display them on settings page.

Also, the transaction fee for send is also one of the settings, so we should plan to make that available on the SEND page.

[theborakompanioni]

@dergigi Hope it can be useful to you: Small preparation and groundwork for this in branch prepare-72-jm-settings. See #172.
Let me know if there is anything I can do.

[editwentyone]

i copied all the settings into Figma, and grouped it a little bit.

• first I would love to know what settings are essential for the user? the rest will be hidden/ automated
• are we/ the user able to manipulate this settings on the fly?

please collaborate here or directly on the Figma file with comments (if you have an account)

https://www.figma.com/file/kfejZJFlwBywvLEnPEmJo1/?node-id=3684%3A77654