Async network build, remove switch_max_range

[S-S-X]

Allows building networks without size limits, building larger network simply takes longer (more globalstep cycles) to complete and start.
Should also prevent possible lag spikes caused by weird huge cable/machine stacks.

Will not yet merge networks if build starts from multiple locations but added technic.merge_networks function to allow doing that.

Network build get 10ms to complete traversing network nodes, if that is not enough then build stops and continues during next globalstep. Switching stations will display build progress.

See #101 for more info.
Closes #101

[S-S-X]

Should probably add network merging before PR merging to prevent unnecessary cache clearing when conflict happens: network build starts from multiple positions, this is even more likely with time limit instead of range limit.

[S-S-X]

Could be good to add automated tests for network merging and fake time variants for current tests that do use multiple networks.
This can be very hard to test manually in game without well known values and timing.
Probably requires adding special support to return fake time through mineunit test framework:
https://github.com/mt-mods/mineunit/blob/b13a73676a4b99ea04ea2e2d758e69db2fc85dde/core.lua#L131-L135

[S-S-X]

Probably okayyish enough... hope so at least. Merging as dev server did not crash yet for me 😄

[BuckarooBanzay]

nice work 🎉