Fail fast on abci callback errors for non production environments

[alpe]

Follow up on #32

Instead of catching and logging errors/ panics, we can fail fast and panic, so that errors can not be missed. They would crash the node.
This is not intended for production setup though.

One solution proposed was a compile-time flag. Other options are start parameter or environment variables. Other ideas?

[alpe]

When done right then this can be a non state breaking change. The "fail-fast" binary must not run in the same environment as production