Add a theme class to store all the custom UI values used in the code.

It will need a setting for selecting the theme in the factory method.

YACReaderLibrary/theme.h

@@ -0,0 +1,38 @@
+#ifndef THEME_H
+#define THEME_H
+
+#include <QtCore>
+
+class Theme
+{
+public:
+    Theme();
+
+    static Theme currentTheme() {
+        Theme t;
+
+        if (true) { //native macos theme
+            t.isMacosNative = true;
+
+            t.disableClassicViewCollapsing = true;
+
+            t.comicsViewTransitionBackground = "#FFFFFF";
+        } else {
+            t.isMacosNative = false;
+
+            t.disableClassicViewCollapsing = false;
+
+            t.comicsViewTransitionBackground = "#2A2A2A";
+        }
+    }
+
+    bool isMacosNative;
+
+    //
+    bool disableClassicViewCollapsing;
+
+    //
+    QString comicsViewTransitionBackground;
+};
+
+#endif // THEME_H