Merge branch 'master' into jgrpp

# Conflicts:
#	.gitignore
#	CMakeLists.txt
#	src/3rdparty/optional/optional.hpp
#	src/group_cmd.cpp
#	src/industry_cmd.cpp
#	src/misc_gui.cpp
#	src/video/sdl2_v.cpp

regression/regression/result.txt

@@ -9075,7 +9075,7 @@ ERROR: IsEnd() is invalid as Begin() is never called
   --Accounting--
     GetCosts():         -5947
     Should be:          -5947
-  GetName():            Road Vehicle 1
+  GetName():            Road Vehicle #1
   SetName():            true
   GetName():            MyVehicleName
   CloneVehicle():       13