Swapping porta_turrets for the new turret machines.

[MistakeNot4892]

Removes the old porta_turret type in favour of Neerti's /obj/machinery/turret/network type. Also adds controls for them and adds presets for the various maps.

TODO

• swap out the old turret types.
• Add console with turret control program.
• Port the old turret control icon to work for modular computers for the console.
• Get turrets to shoot things.
• Get the control program to open.
• Configure access, network, etc. on the preset turrets.