settings file and save/restore ui state

src/settings.cpp

@@ -0,0 +1,26 @@
+#include "pch.h"
+#include "settings.h"
+#include "app.h"
+
+Settings Settings::I;
+
+bool Settings::load()
+{
+    auto path = App::I.data_path + "/settings/pref.bin";
+    BinaryStreamReader sr;
+    if (sr.load(path))
+    {
+        I.props.clear();
+        return I.read(sr);
+    }
+    return false;
+}
+
+bool Settings::save()
+{
+    auto path = App::I.data_path + "/settings/pref.bin";
+    BinaryStreamWriter sw;
+    sw.init();
+    I.write(sw);
+    return sw.save(path);
+}