Refactor the factory validation to allow the user to get more feedback as to what is wrong

eg.

• Missing blocks and their type
• Missing controller
• Controller present but invalid mob
• Controller present but factory tier too low

https://github.com/Ipsis/Woot/tree/feature-guideblock

Completely rewrote the factory structure handling and validation code.
Can now indicate exactly which blocks are missing, incorrect and controller errors.

36f0c80