HUD Themes (#3774)

* HUD Themes

* Prototypes

* field

* oops

* ugh

* Fixes

* Update Content.Client/UserInterface/GameHud.cs

Co-authored-by: ike709 <sparebytes@protonmail.com>

Resources/Prototypes/hud.yml

@@ -0,0 +1,14 @@
+- type: hudTheme
+  id: 0
+  name: ui-options-hud-theme-default
+  path: Default
+
+- type: hudTheme
+  id: 1
+  name: ui-options-hud-theme-modernized
+  path: Modernized
+
+- type: hudTheme
+  id: 2
+  name: ui-options-hud-theme-classic
+  path: Classic