CLuaInstMisc: Add getTimeOfDay() script function

- Set Lua api version to 1.39

src/gui/lua/lua_api_version.h

@@ -4,4 +4,4 @@
  * to luainstance.h changes
  */
 #define LUA_API_VERSION_MAJOR 1
-#define LUA_API_VERSION_MINOR 38
+#define LUA_API_VERSION_MINOR 39

src/gui/lua/lua_misc.cpp

@@ -71,6 +71,7 @@ void CLuaInstMisc::LuaMiscRegister(lua_State *L)
 		{ "GetRevision",     CLuaInstMisc::GetRevision },
 		{ "checkVersion",    CLuaInstMisc::checkVersion },
 		{ "postMsg",         CLuaInstMisc::postMsg },
+		{ "getTimeOfDay",    CLuaInstMisc::getTimeOfDay },
 		{ "__gc",            CLuaInstMisc::MiscDelete },
 		{ NULL, NULL }
 	};
@@ -338,6 +339,20 @@ int CLuaInstMisc::postMsg(lua_State *L)
 	return 0;
 }
 
+int CLuaInstMisc::getTimeOfDay(lua_State *L)
+{
+	CLuaMisc *D = MiscCheckData(L, 1);
+	if (!D) return 0;
+
+	struct timeval t1;
+	double dt;
+	gettimeofday(&t1, NULL);
+	dt = (double)t1.tv_sec + ((double)t1.tv_usec)/1000000ULL;
+
+	lua_pushnumber(L, (lua_Number)dt);
+	return 1;
+}
+
 int CLuaInstMisc::MiscDelete(lua_State *L)
 {
 	CLuaMisc *D = MiscCheckData(L, 1);

src/gui/lua/lua_misc.h

@@ -63,6 +63,7 @@ class CLuaInstMisc
 		static int GetRevision(lua_State *L);
 		static int checkVersion(lua_State *L);
 		static int postMsg(lua_State *L);
+		static int getTimeOfDay(lua_State *L);
 		static int MiscDelete(lua_State *L);
 
 		static void miscFunctionDeprecated(lua_State *L, std::string oldFunc);