Copy-Pasting to existing machine should copy module slots

[seancheey]

As title suggests: I think it makes more sense that copy/paste can add a module inventory request when pasting into a existing machine. Otherwise we have to remove a whole bunch of machines together and paste the machine with module slots again.

Also:

I hope upgrade planner can add a support to insert empty slots with specific modules. (A possible implementation: you could achieve this by regarding "empty module" as another type of module. With this, in additional to insert empty slots, players can also remove unwanted modules from machines)

[ssilk]

Please have a look at https://mods.factorio.com/mod/ModuleInserter
I think, this is more or less, how it should work.