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>

src/client/render/gl/render-settings.json

@@ -75,7 +75,27 @@
     "highlightThicken": 2,
     "defensePostRange": 30,
     "embargoTintRatio": 0.35,
-    "friendlyTintRatio": 0.35
+    "friendlyTintRatio": 0.35,
+    "embargoTintR": 1,
+    "embargoTintG": 0,
+    "embargoTintB": 0,
+    "friendlyTintR": 0,
+    "friendlyTintG": 1,
+    "friendlyTintB": 0
+  },
+  "affiliation": {
+    "selfR": 0,
+    "selfG": 1,
+    "selfB": 0,
+    "allyR": 1,
+    "allyG": 1,
+    "allyB": 0,
+    "neutralR": 0.502,
+    "neutralG": 0.502,
+    "neutralB": 0.502,
+    "enemyR": 1,
+    "enemyG": 0,
+    "enemyB": 0
   },
   "railroad": {
     "railMinZoom": 4,