Plug in the new UiTheme resource

Fixed struct field visibility, initialize the resource, and register it
with the EGUI Debug overlay. The button observers have also been updated
to use the resource.

src/resources.rs

@@ -3,32 +3,31 @@
 use bevy::{color::palettes::css::*, prelude::*};
 
 #[derive(Debug, Reflect, Resource)]
+#[reflect(Resource)]
 pub struct UiTheme {
   // TODO: Panes
 
   // Colors for the "Big Red Buttons" (the main actions of the machines)
   // normal
-  brb_bg: Color,
-  brb_border: Color,
+  pub brb_bg: Color,
+  pub brb_border: Color,
   // hover
-  brb_hover_bg: Color,
-  brb_hover_border: Color,
+  pub brb_hover_bg: Color,
+  pub brb_hover_border: Color,
   // pressed
-  brb_pressed_bg: Color,
-  brb_pressed_border: Color,
-
+  pub brb_pressed_bg: Color,
+  pub brb_pressed_border: Color,
 }
 
 impl FromWorld for UiTheme {
   fn from_world(world: &mut World) -> Self {
     Self {
-        brb_bg: RED.into(),
-        brb_border: DARK_RED.into(),
-        brb_hover_bg: PINK.into(),
-        brb_hover_border: RED.into(),
-        brb_pressed_bg: GREEN.into(),
-        brb_pressed_border: DARK_GREEN.into(),
+      brb_bg: RED.into(),
+      brb_border: DARK_RED.into(),
+      brb_hover_bg: PINK.into(),
+      brb_hover_border: RED.into(),
+      brb_pressed_bg: GREEN.into(),
+      brb_pressed_border: DARK_GREEN.into(),
     }
   }
 }
-