Substitute Parts and Group Parts by Geometry

[Gunzel73]

Following on from an earlier discussion about the sheer number of Kato Unitrack variants, and presumably similar issues with some other brands e.g. Peco.

1) Substitute Equivalent
Add a menu item when right-clicking a track piece, between "search these parts" and "details", called "substitute equivalent". This would load a list of all items with exactly the same geometry; the user can then select one to immediately replace the item on the field. For example, this would make cycling between S248 (20-000) and S248PC (20-875) somewhat faster; much faster if it could be applied to more than one S248 at a time.

2) Group Parts by Geometry
Add a third checkbox in the Search menu, Group Parts by Geometry, so that instead of searching for all WS248, WS248G, WS248PC, WS248S separately, this would cause the search function to select the whole of all these groups at once. For now, the feature could be kept fairly simple, but at a later date it should be amended such that this grouping will not also select parts WS248GF (track feeder), WS248INC (incline), or any of the truss bridges WS248T (20-435 to 20-439), because these cannot be directly substituted.