Make the gate's building easier

[eingousef]

I regroup here two bugs/proposals about gates and walls.

• When you place a wall between two obstacles with the intention of transforming it into a gate, you don't know if your wall will be long enough to be convertible until it's fully built. The longest curtain walls could have a special crenel, shields somewhere, flags on the adjacent wall towers or any small but significant graphical detail, at least on their "virtual" version (when you try to place them), in order to know if the wall part will be long enough to make a gate, before you place the underpinnings.

• Sometimes you build a long wall that cuts the path of working citizen, with the intention of making a gate after it's built. If you forget to do it right after, your citizen are blocked. Would it be possible to have the "transform into gate" button right from the underpinning stage, so you could plan it before the wall is built ?

[Stan]

Wraitii is that related to what you were workin' on ?