Adds 2 more roboports with increased charging slots, robot slots and range.

this is just a fork of https://mods.factorio.com/mod/Factorio_Roboport_mk2 so all credit goes to them

the main changes are to do with the amount and arrangement of the charging slots. mk2 has 32 charging slots and mk3 has 64 charging slots. I also modified the power values to better suit the increased slots