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[] = [

tests/util/viewStubs.ts

@@ -7,10 +7,10 @@
  */
 
 import { colord } from "colord";
+import { Theme } from "../../src/client/theme/Theme";
 import { GameView } from "../../src/client/view/GameView";
 import { PlayerView } from "../../src/client/view/PlayerView";
 import { Config } from "../../src/core/configuration/Config";
-import { Theme } from "../../src/core/configuration/Theme";
 import {
   NameViewData,
   PlayerType,
@@ -45,10 +45,6 @@ export function stubTheme(): Theme {
     falloutColor: () => white,
     font: () => "Arial",
     textColor: () => "#000000",
-    selfColor: () => white,
-    allyColor: () => white,
-    neutralColor: () => grey,
-    enemyColor: () => grey,
     spawnHighlightColor: () => white,
     spawnHighlightSelfColor: () => white,
     spawnHighlightTeamColor: () => white,