Update network cache building to use execution buckets

[S-S-X]

Upgrade network building so that it can be used to build caches for any network size and change technic.switch_max_range to be absolute count of network nodes to be checked and added to cache.

After technic.switch_max_range is reached mark network as incomplete and save queues, next globalstep then continues where previous one stopped. Mark network as complete after there's no queue available.

Normal network execution should then begin if network is marked as complete and if not then continue building network.

Multiple switching stations might create challenges here as network building can start at different locations, not sure how to handle this. One way could be to allow only single network build operation and only start new ones after one under construction is completed or disappears.

Also consider possibility to do same for actual network execution for huge and/or laggy networks.

Depends on #96 and should be started only after that PR is merged.