Prevent memory exhaustion attacks via bincode

[ecton]

We shouldn't ever use bincode::deserialize directly. The preferred method is to use the Options trait. The DefaultOptions struct talks about what options are set up by default, and the important part for us is the byte limit.

[daxpedda]

When I start cleaning up Fabruic I will move all TODOs from the code into issues, this is one of them.