New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/std/target_os.hpp

@@ -0,0 +1,41 @@
+#pragma once
+
+#if defined(ANDROID) || defined(__ANDROID__)
+  #define OMIM_OS_ANDROID
+  #define OMIM_OS_NAME "android"
+  #define OMIM_OS_MOBILE
+
+#elif defined(__APPLE__)
+  #include <TargetConditionals.h>
+  #if (TARGET_OS_IPHONE > 0)
+    #define OMIM_OS_IPHONE
+    #define OMIM_OS_NAME "ios"
+    #if (TARGET_IPHONE_SIMULATOR > 0)
+      #define OMIM_OS_IPHONE_SIMULATOR
+    #else
+      #define OMIM_OS_IPHONE_DEVICE
+    #endif
+    #define OMIM_OS_MOBILE
+
+  #else
+    #define OMIM_OS_MAC
+    #define OMIM_OS_NAME "mac"
+    #define OMIM_OS_DESKTOP
+  #endif
+
+#elif defined(_WIN32)
+  #define OMIM_OS_WINDOWS
+  #define OMIM_OS_NAME "win"
+  #define OMIM_OS_DESKTOP
+
+  #ifdef __MINGW32__
+    #define OMIM_OS_WINDOWS_MINGW
+  #else
+    #define OMIM_OS_WINDOWS_NATIVE
+  #endif
+
+#else
+  #define OMIM_OS_LINUX
+  #define OMIM_OS_NAME "linux"
+  #define OMIM_OS_DESKTOP
+#endif