Pipe painter (now with airlock painter) (#19031)

* Add a pipe painting function to the airlock painter

Signed-off-by: c4llv07e <kseandi@gmail.com>

* Rename engineer painter to omnipainter

Signed-off-by: c4llv07e <kseandi@gmail.com>

* review changes

Signed-off-by: c4llv07e <kseandi@gmail.com>

* fix migration duplicate

Signed-off-by: c4llv07e <kseandi@gmail.com>

---------

Signed-off-by: c4llv07e <kseandi@gmail.com>

Content.Shared/SprayPainter/Prototypes/AirlockGroupPrototype.cs

@@ -0,0 +1,19 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.SprayPainter.Prototypes;
+
+[Prototype("AirlockGroup")]
+public sealed class AirlockGroupPrototype : IPrototype
+{
+    [IdDataField]
+    public string ID { get; } = default!;
+
+    [DataField("stylePaths")]
+    public Dictionary<string, string> StylePaths = default!;
+
+    // The priority determines, which sprite is used when showing
+    // the icon for a style in the SprayPainter UI. The highest priority
+    // gets shown.
+    [DataField("iconPriority")]
+    public int IconPriority = 0;
+}