- Removed all unused imports
- Fixed random compiler errors
- Removed all of the 'sucess_response' helpers.
- Enabled all of the API endpoints again, wrapping in 'into_boxfut'
- Tidied up /metrics endpoint
- Added a 'body_text' part to ResponseBuilder, mainly for the Prometheus /metrics endpoint
- Cleaned up the unnecessary helpers::* imports, to be more explicit.
- Cleaned up imports
- Moved ApiError and such to it's own error.rs
- Obsoleted 'success_response' in favour of new async regular and json only flavours
- Made ApiError work async and be derived from hyper errors
- Added a check to ensure an error is thrown if a non-json encoding is requested on a json-only function
- Made all the individual service functions return futures (only node and network for now)
