Consolidate styles (#1116)

* Consolidate styles into a Styles class and clean up code

* Format

* Add style_bg_dark_grey for nav bar

* Fix bugs found in PR

* Rename styles

* Add bg_white style

---------

Co-authored-by: kallanreed <kallanreed@outlook.com>
Co-authored-by: gullradriel <3157857+gullradriel@users.noreply.github.com>

firmware/application/ui/ui_styles.hpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2023 Kyle Reed
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __UI_STYLES_H__
+#define __UI_STYLES_H__
+
+#include "ui_painter.hpp"
+
+namespace ui {
+
+class Styles {
+   public:
+    /* White foreground. */
+    static const Style white;
+
+    /* White background. */
+    static const Style bg_white;
+
+    /* White foreground, small font. */
+    static const Style white_small;
+
+    /* Yellow foreground. */
+    static const Style yellow;
+
+    /* Green foreground. */
+    static const Style green;
+
+    /* Red foreground. */
+    static const Style red;
+
+    /* Blue foreground. */
+    static const Style blue;
+
+    /* Blue background. */
+    static const Style bg_blue;
+
+    /* Light grey foreground. */
+    static const Style light_grey;
+
+    /* Grey foreground. */
+    static const Style grey;
+
+    /* Dark grey foreground. */
+    static const Style dark_grey;
+
+    /* Dark grey background. */
+    static const Style bg_dark_grey;
+
+    /* Orange foreground. */
+    static const Style orange;
+};
+
+}  // namespace ui
+
+#endif /*__UI_STYLES_H__*/