* initial commit. integ tests passing, need to re-run unit & my own personal tests
* partial refactoring to remove Protocol::ANY
* improve naming
* remove all usages of ProxyConfiguration::Protocol::ANY
* fix ut
* blabla
* support url functions as well
* support for HTTPS requests over HTTP proxy with tunneling off
* remove gtestabc
* fix silly mistake
* ...
* remove usages of httpclientsession::proxyconfig in src/
* got you
* remove stale comment
* it seems like I need reasonable defaults
* fix ut
* add some comments
* remove no longer needed header
* matrix out
* add https over http proxy with no tunneling
* soem docs
* partial refactoring
* rename to use_tunneling_for_https_requests_over_http_proxy
* improve docs
* use shorter version
* remove useless test
* rename the setting
* update
* fix typo
* fix setting docs typo
* move ); up
* move ) up
* Replicate poco into base/poco/
* De-register poco submodule
* Build poco from ClickHouse
* Exclude poco from stylecheck
* Exclude poco from whitespace check
* Exclude poco from typo check
* Remove x bit from sources/headers (the style check complained)
* Exclude poco from duplicate include check
* Fix fasttest
* Remove contrib/poco-cmake/*
* Simplify poco build descriptions
* Remove poco stuff not used by ClickHouse
* Glob poco sources
* Exclude poco from clang-tidy
