Feature Request: Allow change of the Colour of Conversation Bubbles

[cb2T5rju]

Bug description

Contacts imported from the iOS app are given a default conversation bubble colour and it cannot be changed in the Desktop app (only through the Android app). This is an issue in the Android skins (which includes the dark skin).

Steps to reproduce

1. Include a colour select in the conversation settings button drop-down menu.
2. step two
3. step three

Screenshots

Couldn't upload the screenshot I took, but in the three-button menu, include a "choose conversation colour" option under "Conversation Settings" like on Android.

Platform info

Signal version:

v1.10.0-beta.1

Operating System:

Ubuntu 18.04 (but this shouldn't make a difference).