AAI Loaders: Electric power

Makes all loaders created by Earendel's AAI Loaders mod
powered via electricity rather than being free or requiring lubricant

Details

• AAI Loaders mod is forced into "expensive" unlubricated mode,
  to make sure its lubricant supply scripting won't even try to run.
• Unlubricated recipes adjusted to cost roughly 5 times less. Powering with electricity
  is itself simpler than supplying lubricant, so making loaders roughly 2 times more
  expensive than lubricant mode looks fair enough
• All loaders now use Factorio's native energy system via "energy_source" property.
  This makes them run at native speeds. No scripting.
• Base cost of each item transported is 6kJ, yet it lowers slightly with each speed
  tier above 15 items/s. As a result, normal loader is 92kW, fast is ~160kW and express is 218kW.

Known shortcomings

• Loaders description says they have no cost. This is because localization wasn't touched at all
• Recipe adjustment logic is very primitive, so may not always play as desired

Plans

• Make lubricated mode work again, via Factorio's native power system
• Balancing
• Introduce recipes and localization overrides

Special thanks

• Wube, for the awesome game
• Earendel, for awesome standalone loaders mod