Fix machine to power cable connections

Problem:

Network does not care if power cable is actually connected or not by connect_sides rules.

Fix it:

To fix this there should be connection matrix calculated using connect_sides rules and that should be then checked when machine is about to be attached to actual network.

For example, based on this information:
https://github.com/mt-mods/technic/blob/c58673f2af88dc5c6a4df03443415cdbfa97392a/technic/machines/register/generator.lua#L126
Something like this should be added as rules
(not sure if this follows convention how engine gives directions but similar to this at least):

{
  {x= 0, y=-1, z= 0}, -- Bottom
  {x= 0, y= 0, z= 1}, -- Back
  {x=-1, y= 0, z= 0}, -- Left
  {x= 1, y= 0, z= 0}, -- Right
}

IMO this can be implemented at first by allowing just rotation around y but all possible rotations would be nice, I bet there's tested and working copy/paste code for that somewhere...
However I think that engine also does not always handle rotation correctly with connect_sides so very simple y axle rotation would be fine too.

Where to?

Check should be added here: https://github.com/mt-mods/technic/blob/c58673f2af88dc5c6a4df03443415cdbfa97392a/technic/machines/network.lua#L199-L217
And possibly also here: https://github.com/mt-mods/technic/blob/c58673f2af88dc5c6a4df03443415cdbfa97392a/technic/machines/register/cables.lua#L23-L52

Start with the connect_sides rules in technic/machines/register/generator.lua, then inspect the network attachment logic in technic/machines/network.lua around lines 199-217 and the cable registration in technic/machines/register/cables.lua. Determine the supported rotation behavior and verify that machines attach only when the power cable direction matches the connection rules.