Reorganize source files into logical subdirectories

Co-authored-by: Hirek193 <23196899+Hirek193@users.noreply.github.com>

vehicle/AirCoupler.cpp

@@ -0,0 +1,91 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#include "stdafx.h"
+#include "AirCoupler.h"
+
+#include "Model3d.h"
+#include "parser.h"
+
+AirCoupler::AirCoupler()
+{
+    Clear();
+}
+
+AirCoupler::~AirCoupler()
+{
+}
+
+/**
+ * \return 1 when \(straight\) TModel3d \c only ModelOn exists
+ * \return 2 when \(slanted\) TModel3d \c ModelxOn exists
+ * \return 0 when neither of them exist
+ */
+int AirCoupler::GetStatus()
+{
+    if (ModelxOn)
+		return 2;
+    if (ModelOn)
+		return 1;
+    return 0;
+}
+
+/**
+ * Reset pointers and variables.
+ */
+void AirCoupler::Clear()
+{
+    ModelOn = NULL;
+    ModelOff = NULL;
+    ModelxOn = NULL;
+    On = false;
+    xOn = false;
+}
+
+/**
+ * Looks for submodels in the model and updates pointers.
+ */
+void AirCoupler::Init(std::string const &asName, TModel3d *Model)
+{
+    if (!Model)
+        return;
+    ModelOn = Model->GetFromName(asName + "_on"); // Straight connect.
+    ModelOff = Model->GetFromName(asName + "_off"); // Not connected. Hung up.
+    ModelxOn = Model->GetFromName(asName + "_xon"); // Slanted connect.
+}
+/**
+ * Gets name of submodel \(from cParser \b *Parser\),
+ * looks for it in the TModel3d \b *Model and update pointers.
+ * If submodel is not found, reset pointers.
+*/
+void AirCoupler::Load(cParser *Parser, TModel3d *Model)
+{
+	std::string name = Parser->getToken<std::string>();
+    if(Model)
+    {
+		Init(name, Model);
+	}
+    else
+    {
+        ModelOn = NULL;
+        ModelxOn = NULL;
+        ModelOff = NULL;
+    }
+}
+
+// Update submodels visibility.
+void AirCoupler::Update()
+{
+    if (ModelOn)
+        ModelOn->iVisible = On;
+    if (ModelOff)
+        ModelOff->iVisible = !(On || xOn);
+    if (ModelxOn)
+        ModelxOn->iVisible = xOn;
+}