refactor(editor): split the track mode into its gizmo, kept records, switch drive, switch slide and track bed files; path geometry shared in editorGeometry instead of four copies of the reversed path, track shape rules (stretching, rolls at joints, middle, switch axis, drive spot) in editor_track, fitting the track to the ground in ground_follow with the terrain query passed in, the record layer and the switch classification in the stores; long gizmo, record watch and switch slide functions broken up, out-parameters replaced by optional results

application/editormodeshared.h

@@ -0,0 +1,21 @@
+/*
+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/.
+*/
+
+#pragma once
+
+#include "imgui/imgui.h"
+#include "utilities/translation.h"
+
+float constexpr kDragPixels{5.0f};
+
+inline void item_tooltip(char const *Text)
+{
+	if (ImGui::IsItemHovered())
+		ImGui::SetTooltip("%s", STR_C(Text));
+}