Change various internal config containers to use a "bool" type instead of MgmtInt

Even though all configs in librecords are MgmtInt (64-bit), there's no reason why for example the HTTP struct holding the current configs need to use 64-bit ints to hold the types that are booleans. Changing this will reduce some memory consumption (I'd estimate up to 100MB on a busy server), but also reduce the amount of memory that has to be copied for each transaction.