Feature: custom user color and alias

[rod41732]

Allows defining custom color and/or alias for chatters

Screenshots

• How aliased users looks like in Chat Screenshot_20221123-150917
• Settings Screen (Settings -> Chat -> Custom User Display) (target user, color, alias) Screenshot_20221123-150954

Note:

• name matching is case-insensitive
• leaving blank in color or alias will not override their color or name
• color needs to be prefixed with # (it's parsed by Color.parseColor). Entering invalid color simply has no effect
• change take place "immediately" for new messages after settings applied, but old message won't be affected. Essentially, restart would be required.

[flex3r]

Some comments regarding the ui:

[rod41732]

LGTM :+1: