Replace Model feature to be added to wadtool

[TrainWrack]

Wadmerger had a feature that would replace all the meshes on an object from another skeleton from the wad. It would be helpful to have in WadTool as well as most object are modified for TEN. If you want to use objects from Trsearch you have to replace all meshes one by one.

Wadtool already has a feature to replace a single mesh from wad meshes. Maybe it can be extended for all meshes of the object. It should only be possible if the mesh numbers for the source and destination are same.