Fix special members for http classes
Stream generated JSON.
Optimize pathfinding operations (RIPD-537):
* Calculate and cache Account hashes without holding locks.
* Fast hash-based path element comparison.
* Use emplace instead of find/insert
Also report mismatched built ledger
Overlay cleanup
[FOLD] document proto file
[FOLD] cleanup overlay
[FOLD] cleanup overlay
[FOLD] cleanup overlay
[FOLD] cleanup overlay
[FOLD] Break out buildHello
Use transform_iterator in http::headers
Add base64 conversions and tests
[WIP]