Vendor raptor source files (was embedded gitlink)

Tree vendored at upstream 0019c5dd; origin + license recorded in
raptor/VENDOR.txt. Windows SDL dev packages excluded via .gitignore.

raptor/src/windows.h

@@ -0,0 +1,33 @@
+#pragma once
+
+enum DEMOTYPE
+{
+	DEM_INTRO,
+	DEM_CREDITS,
+	DEM_DEMO1G1,
+	DEM_DEMO2G1,
+	DEM_DEMO3G1,
+	DEM_DEMO1G2,
+	DEM_DEMO2G2,
+	DEM_DEMO3G2,
+	DEM_DEMO1G3,
+	DEM_DEMO2G3,
+	DEM_DEMO3G3
+};
+
+extern int opt_detail;
+extern int songsg1[];
+extern int songsg2[];
+extern int songsg3[];
+
+void WIN_Order(void);
+void WIN_AskExit(void);
+void WIN_MainMenu(void);
+void WIN_MainLoop(void);
+void WIN_Pause(void);
+int WIN_AskBool(const char *question);
+void WIN_WinGame(int game);
+void WIN_Msg(const char *msg);
+void WIN_SetLoadLevel(int level);
+void WIN_EndLoad(void);
+void WIN_LoadComp(void);