Build 126 Released

Various minor bugfixes
Made water extractor use metaglass for building, to be consistent with pumps
Added automatic conveyor/conduit bridging over obstacles
Added 'defender' AI for Oct; follows nearby units
Cores can now replace most transport blocks; turrets can now replace each other
Improved bridge & power node linking previews
Buffed Segment & Vela
Added logicUnitBuild rule; Sandbox server owners are advised to disable logic building with `rules add logicUnitBuild false`.
Logic: Changed default unit control state to be 'idle', not 'stop'
Logic: Made config / unit building instructions accept buildings as configuration to copy their config. This allows for self-replicating processors.
Logic: Added sensors for `dead`, `controller`, `size`, `boosting`
Logic: Made `controlled` return ctrlProcessor/ctrlPlayer/ctrlFormation/0 depending on controller type
Logic: Deprecated "commanded"; use `controlled` instead! This sensor will be removed in a future release.
Logic: More hints