Vent and Siphon visualizer and icon fixes (#2288)

* Half pipes

* PipeVisualizer pipeRSI field

* Vent and Siphon visualizer fixes

Co-authored-by: py01 <pyronetics01@gmail.com>

Resources/Textures/Constructible/Atmos/pipe.rsi/meta.json

@@ -25,6 +25,24 @@
             ]
          ]
       },
+      {
+         "name":"pipeHalf2",
+         "directions":4,
+         "delays":[
+            [
+               1.0
+            ],
+            [
+               1.0
+            ],
+            [
+               1.0
+            ],
+            [
+               1.0
+            ]
+         ]
+      },
       {
          "name":"pipeBend2",
          "directions":4,