Merge branch 'master' into jgrpp

# Conflicts:
#	src/elrail.cpp
#	src/ground_vehicle.hpp
#	src/landscape.cpp
#	src/saveload/afterload.cpp
#	src/saveload/saveload.h
#	src/tile_cmd.h
#	src/town_cmd.cpp
#	src/tunnelbridge_cmd.cpp

src/core/bitmath_func.hpp

@@ -31,7 +31,7 @@
  * @return The selected bits, aligned to a LSB.
  */
 template <typename T>
-debug_inline static uint GB(const T x, const uint8 s, const uint8 n)
+debug_inline constexpr static uint GB(const T x, const uint8 s, const uint8 n)
 {
 	return (x >> s) & (((T)1U << n) - 1);
 }