Node settings UI

[samuelmanzanera]

Description

This PR provides a web interface to customize node's reward address configuration.

Fixes #618

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Visit the page http://localhost:4000/settings
You should see the settings form.
Change the reward address.
A new transaction would have been submitted.
The new reward address is present in the node's details page.
Also, the previous received rewards would have been transferred to the new reward address (transformed as UCO).
The new reward address will receive the automatic rewards then.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[apoorv-2204]

we might have a few visual clues. Otherwise great 👍

[samuelmanzanera]

we might have a few visual clues. Otherwise great 👍

Ok I will try to make it more responsive

[apoorv-2204]

👍