Hint orange arrows in utility-sprites.lua

[Articulating]

Making a GUI in a scenario is already hard enough. It would be greatly appreciated if you could add the 4 hint-orange-arrows to the utility-sprites.lua so that they can be used in scenarios, especially the two sideways arrows as none are currently available. Hopefully you find this is a useful but simple change. Thank you.

[Rseding91]

All of the utility sprites are being converted to be defined in utility-sprites.lua for 0.15.