Merge tag '1.6.1' into develop

v1.6.1
- Fix for missing method in RateLib's AbsoluteLimiter
New: one implementation of HttpHeaders support for use everywhere
New: test coverage for HttpAddress
New: move data sanitation out of HttpLib for now
New: test coverage for the simple HttpServer
Fix: can run unit tests once more
Fix: can run unit tests once more
Fix: missing code coverage hint
Fix: remove unused code
New: better exceptions for problems when using HTTP
New: support for uploading HTTP streams
Fix: ignore the composer.lock file
WIP: placeholders for future work to improve our HTTP server
New: completely new approach to working with config files - will eventually replace the existing code
Fix: bug fixes for the new ConfigHelper approach
Fix: need to return the config after loading
Fix: look inside the dotfiles folder for the runtime config
Fix: another place where we forgot to look in the dotfiles folder!
New: find a list of config files in a folder tree
Fix: add error when unable to decode JSON