Additional Virtual Signals

[Nebabon]

TL;DR

Add additional virtual signals to allow "easier" symbol station labels

What?

More virtual signals please! I love them as they make it really easy to see at a glance what the station is doing (and they just look lovely). I use them for all stations names since they are all uniform width (monospaced).

I would love to see:

• left facing input

• left facing outputput

• construction symbol

Why?

I think it helps with the organization of the station names. Currently, I use the formula "[virtual-signal=signal-weapon][virtual-signal=signal-output][virtual-signal=signal-L]" to load the train and "[virtual-signal=signal-weapon][virtual-signal=signal-input][virtual-signal=signal-U]" to unload. It looks weird to me that the arrow is pointing to the "U" instead of the "icon". Since 2 of the 3 signals exist, I think it would easy to just flip the signal image. Not sure how to handle the possible naming conflict or change however.