Add charge set/get callbacks (#600)

sfence

2022-06-06 0211c582e9ce8745e19ff49496b026d393dad074

 technic/machines/LV/solar_array.lua

@@ -10,7 +10,7 @@
   recipe = {
      {'technic:solar_panel',        'technic:solar_panel',    'technic:solar_panel'},
      {'technic:carbon_steel_ingot', 'technic:lv_transformer', 'technic:carbon_steel_ingot'},
      {'',                           'technic:lv_cable0',      ''},
      {'',                           'technic:lv_cable',       ''},
   }
})