Feature/Move theme system from core to client-side ThemeProvider (#4108)

**Add approved & assigned issue number here:** 

Resolves #2549

## Description:

Themes are purely for the client's rendering, and the server doesn't
need context on them. This PR moves `Theme.ts` from
`src/core/configuration` to `src/client/theme` and moves affiliation
colors to `render-settings.json`.

This is to support the ability to add additional themes more quickly,
such as colorblind-friendly themes. No visible changes occur from this
refactor.

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory

## Please put your Discord username so you can be contacted if a bug or
regression is found:

jetaviz

---------

Co-authored-by: Josh Harris <josh@wickedsick.com>

tests/Colors.test.ts

@@ -2,7 +2,7 @@ import { colord, Colord } from "colord";
 import {
   ColorAllocator,
   selectDistinctColorIndex,
-} from "../src/core/configuration/ColorAllocator";
+} from "../src/client/theme/ColorAllocator";
 import {
   blue,
   botColor,
@@ -12,7 +12,7 @@ import {
   red,
   teal,
   yellow,
-} from "../src/core/configuration/Colors";
+} from "../src/client/theme/Colors";
 import { ColoredTeams } from "../src/core/game/Game";
 
 const mockColors: Colord[] = [