This mod is a QoL mod for the early game to better leverage
blueprints. It adds to CTRL-Left click the capability to place items
only if the appropriate ghost is present. It takes orientation and
configuration from the ghost itself too.

Use it by placing a blueprint, then selecting an appropriate item type
(for instance yellow belts) and CTRL-clicking everywhere (within build
range) when a belt should be. They will be placed with the
appropriate orientation. If one CTRL-clicks by mistake where there
shouldn't be a belt, nothing happens (no belt is placed, the ghost of
whatever should be there stays). This allows to fill a blueprint by
hand quickly without errors.

Sadly, click-then-drag is not currently available due to limitations
of the modding interface.

TODO: implement tile support in addition to entities

TODO: maybe add upgrade support too (but there may be a bad
interaction with inserters).