Jelly + ice cream theme (#486)

* Update config_window.cpp

* Update config_window.hpp

* Rename theme to Cream

* Rename theme to cream harder

---------

Co-authored-by: wheremyfoodat <44909372+wheremyfoodat@users.noreply.github.com>

include/panda_qt/config_window.hpp

@@ -16,6 +16,7 @@ class ConfigWindow : public QDialog {
 		Light = 1,
 		Dark = 2,
 		GreetingsCat = 3,
+		Cream = 4,
 	};
 
 	Theme currentTheme;
@@ -26,4 +27,4 @@ class ConfigWindow : public QDialog {
   public:
 	ConfigWindow(QWidget* parent = nullptr);
 	~ConfigWindow();
-};
+};