settings: implement KeyValueStore (#1659)

* settings: implement KeyValueStore and dependencies

* settings: update KeyValueStore for recent refactoring

* settings: address feedback

libraries/libstratosphere/source/settings/impl/settings_spl.hpp

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere.hpp>
+
+namespace ams::settings::impl {
+
+    enum SplHardwareType : u8 {
+        SplHardwareType_None        = 0x0,
+        SplHardwareType_Icosa       = 0x1,
+        SplHardwareType_IcosaMariko = 0x2,
+        SplHardwareType_Copper      = 0x3,
+        SplHardwareType_Hoag        = 0x4,
+        SplHardwareType_Calcio      = 0x5,
+        SplHardwareType_Aula        = 0x6,
+    };
+
+    bool IsSplDevelopment();
+    SplHardwareType GetSplHardwareType();
+    bool IsSplRetailInteractiveDisplayStateEnabled();
+    u64 GetSplDeviceIdLow();
+
+}