Allow editing sensors through equipment tab

Add a column to the equipment table that shows if a sensor is attached to a
tank, or which sensors would be available to attach to a tank that currently
doesn't have a pressure sensor associated with it.

Changing the sensor assignement can be undone.

This column is hidden by default as this is a somewhat unusual activity.

Signed-off-by: Michael Andreen <michael@andreen.dev>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-models/cylindermodel.h

@@ -27,6 +27,7 @@ public:
 		USE,
 		WORKINGPRESS_INT,
 		SIZE_INT,
+		SENSORS,
 		COLUMNS
 	};