Merge branch 'master' into jgrpp

# Conflicts:
#	src/animated_tile.cpp
#	src/cargopacket.h
#	src/cheat_gui.cpp
#	src/company_cmd.cpp
#	src/company_gui.cpp
#	src/date.cpp
#	src/disaster_vehicle.cpp
#	src/dock_gui.cpp
#	src/economy.cpp
#	src/engine.cpp
#	src/error_gui.cpp
#	src/fontcache/spritefontcache.cpp
#	src/game/game_gui.cpp
#	src/game/game_text.cpp
#	src/gfx.cpp
#	src/graph_gui.cpp
#	src/highscore_gui.cpp
#	src/industry_cmd.cpp
#	src/lang/dutch.txt
#	src/lang/english_AU.txt
#	src/lang/english_US.txt
#	src/lang/finnish.txt
#	src/lang/french.txt
#	src/lang/italian.txt
#	src/lang/portuguese.txt
#	src/lang/russian.txt
#	src/lang/turkish.txt
#	src/lang/vietnamese.txt
#	src/main_gui.cpp
#	src/misc_gui.cpp
#	src/network/network_gui.cpp
#	src/network/network_server.cpp
#	src/newgrf.cpp
#	src/newgrf.h
#	src/newgrf_generic.cpp
#	src/news_gui.cpp
#	src/openttd.cpp
#	src/os/unix/unix.cpp
#	src/os/windows/font_win32.cpp
#	src/os/windows/win32.cpp
#	src/rail_gui.cpp
#	src/road_gui.cpp
#	src/saveload/afterload.cpp
#	src/saveload/misc_sl.cpp
#	src/saveload/oldloader_sl.cpp
#	src/saveload/saveload.cpp
#	src/saveload/saveload.h
#	src/script/script_gui.cpp
#	src/settings_table.cpp
#	src/signs_gui.cpp
#	src/smallmap_gui.cpp
#	src/smallmap_gui.h
#	src/spritecache.cpp
#	src/spritecache.h
#	src/spriteloader/grf.cpp
#	src/station_cmd.cpp
#	src/statusbar_gui.cpp
#	src/stdafx.h
#	src/strgen/strgen_base.cpp
#	src/subsidy.cpp
#	src/table/settings/difficulty_settings.ini
#	src/texteff.cpp
#	src/timetable_cmd.cpp
#	src/timetable_gui.cpp
#	src/toolbar_gui.cpp
#	src/town_cmd.cpp
#	src/town_gui.cpp
#	src/townname.cpp
#	src/vehicle.cpp
#	src/waypoint_cmd.cpp
#	src/widgets/dropdown.cpp
#	src/window.cpp

src/timer/timer_game_tick.h

@@ -0,0 +1,34 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file timer_game_tick.h Definition of the tick-based game-timer */
+
+#ifndef TIMER_GAME_TICK_H
+#define TIMER_GAME_TICK_H
+
+#include "gfx_type.h"
+
+#include <chrono>
+
+/** Estimation of how many ticks fit in a single second. */
+static const uint TICKS_PER_SECOND = 1000 / 27 /*MILLISECONDS_PER_TICK*/;
+
+/**
+ * Timer that represents the game-ticks. It will pause when the game is paused.
+ *
+ * @note Callbacks are executed in the game-thread.
+ */
+class TimerGameTick {
+public:
+	using TPeriod = uint;
+	using TElapsed = uint;
+	struct TStorage {
+		uint elapsed;
+	};
+};
+
+#endif /* TIMER_GAME_TICK_H */