Make FV settings to indicate the MQTT client to use
Fix a compilation error caused by ERROR macro

Somewhere in the Win32 API there is a macro declaration for ERROR.
This macro, again, is clashing with the value ERROR of the `log_level`
enum.

Fucking stupid Microsoft engineers: do you really though nobody would
be interested on using such a token in their programs? I've lost half
an hour chasing the source of this stupid error. Thank you very much
for the frustrating experience that represents programming in this
bullshit of platform.
Fix misc errors

A weird guard macro, a missing header and a contextless name for a
logger component.
More convenient processing of exports

Instead of processing the exports file immediately from the domain
object, a new unit is created for that. In case of FSUIPC Offsets,
`conf/exports_fsuipc.h` is provided.

Not this implementation is capable of reading hexadecimal offset
addresses when they are represented by strings begining with `0x`.
Make module to setup MQTT client and domains.