technic API

This is an initial version of the API that can be used by mods.

technic.register_tier(tier, description)
- Registers a network type (tier)
- tier: string, short name (ex. LV)
- description: string, long name (ex. Low Voltage)
technic.register_machine(tier, nodename, machine_type)
- Registers a machine bound to the network tier
- tier: see register_tier
- nodename: string, node name
- machine_type: string, following options are possible:
  - "RE": Receiver
  - "PR": Producer
  - "BA": Battery, energy storage