Placing ghost over entity creates upgrade-request

[Mylon]

tl;dr make the ghost-placing tool work on existing entities

When I'm upgrading my factory, I'll often click an item over a bunch of entities (e.g. Assembler 2 -> Assembler 3) to upgrade them. But if I run out of this item, the ghost entity instead says entity is in the way. If the ghost-entity inner type is in the same fast-replace group as the target, it should create an upgrade request for that entity so the action would properly reflect the player's intent instead of fail and require the player to either switch their workflow or stop what they're doing to fetch more of that item.