http-api: encode json Colors as ARGB hex codes

http-api/src/main/java/net/runelite/http/api/gson/ColorTypeAdapter.java

@@ -43,10 +43,7 @@ public class ColorTypeAdapter extends TypeAdapter<Color>
 		}
 
 		int rgba = value.getRGB();
-		out.beginObject()
-			.name("value")
-			.value(rgba)
-			.endObject();
+		out.value(String.format("#%08X", rgba));
 	}
 
 	@Override
@@ -57,7 +54,18 @@ public class ColorTypeAdapter extends TypeAdapter<Color>
 			case NULL:
 				in.nextNull();
 				return null;
+			case STRING:
+			{
+				String value = in.nextString();
+				if (value.charAt(0) == '#')
+				{
+					value = value.substring(1);
+				}
+				int intValue = Integer.parseUnsignedInt(value, 16);
+				return new Color(intValue, true);
+			}
 			case BEGIN_OBJECT:
+			{
 				in.beginObject();
 				double value = 0;
 				while (in.peek() != JsonToken.END_OBJECT)
@@ -74,6 +82,7 @@ public class ColorTypeAdapter extends TypeAdapter<Color>
 				}
 				in.endObject();
 				return new Color((int) value, true);
+			}
 		}
 		return null; // throws
 	}