Sends the same events from tubelib interaction as would be sent from pipeworks
* Moved the tube_can_insert and tube_insert_object callbacks out of the node definition so they can be re-used in the tubelib registration
* Optionally required tubelib and registered callbacks for pushing and pulling
* Used "speculative pull" variable to only send a "take" event if tubelib's unpull is not called after a pull - this happens when it tries to take an item but there is no room, so it fails
Digilines is probably used by most people in its entirety.
I've retained the ability to disable inventory, rtc, lightsensor and
LCD by the minetest settings "diglines_enable_rtc" etc.. If set to
"false", these components will not be loaded. It is assumed by default
that these are enabled.
In the conversion the digilines_lcd:lcd node was renamed to
digilines:lcd (same for all the other nodes). To retain backwards
compatibility I've provided aliases for each of these nodes.
