extract iOS helpers into a shared lib

ios/iOS_utils.h

@@ -0,0 +1,31 @@
+/*
+ * iOS_utils.h, part of VCMI engine
+ *
+ * Authors: listed in file AUTHORS in main folder
+ *
+ * License: GNU General Public License v2.0 or later
+ * Full text of license available in license.txt file, in main folder
+ *
+ */
+#pragma once
+
+#include <TargetConditionals.h>
+
+#pragma GCC visibility push(default)
+namespace iOS_utils
+{
+const char *documentsPath();
+const char *cachesPath();
+
+#if TARGET_OS_SIMULATOR
+const char *hostApplicationSupportPath();
+#endif
+
+const char *bundlePath();
+const char *frameworksPath();
+
+const char *bundleIdentifier();
+
+double screenScale();
+}
+#pragma GCC visibility pop