1.2.1-bcb26fd6

	* fix issue where trackers from magnet links were not included in create_torrent()
	* make peer_info::client a byte array in python binding
	* pick contiguous pieces from peers with high download rate
	* fix error handling of moving storage to a drive letter that isn't mounted
	* fix HTTP Host header when using proxy

1.2.1 release

	* add dht_pkt_alert and alerts_dropped_alert to python bindings

* [vcpkg] Add "Homepage" field to the CONTROL files.

* [boost] Update to 1.70.0

* [boost-build] Update to 1.70.0

* [folly][freeopcua][libtorrent][websocketpp] Upgrades/patches to handle boost 1.70

* [boost-variant] Revert to 1.69 due to regression
[fizz][folly] Update and fix for boost 1.70
[libsodium] Use CMake buildsystem replacement to enable non-Windows

* [wangle] Update. [folly] Avoid linking debug libs in release.

* [pcl] Fix compatibility with boost 1.70

* [fizz] Handle merge regression

* [arrow] Modernize and fix cmake targets

* [boost-type-traits] Update patches for arm64-windows

* [boost-locale] Add boost-system and boost-thread as arm64 dependencies

* [ompl] Add missing boost-timer dependency

* Update boost to 1.69. Fixes #5023

- Remove boost-signal (rationale: deprecated and removed in 1.69)
- Remove boost-hana workaround by xiangfan-ms #4186 #3579 (rationale: 1.69 incorporates required fixes in hana master branch; builds fine in VS2017 15.9)

* [boost-signals] Restore signals from boost 1.68 because it is required by wt

* [boost-vcpkg-helpers] Improve dependency detection

* [boost-iostreams] Revert to cmake build to enable dependencies

* [boost-iostreams] Fix use of zstd in static builds

* [libtorrent] Update to 1.2.0

* [wt] Update to 4.0.5

* [boost-safe-numerics] [boost-vcpkg-helpers] Added safe_numerics; slight mod to regex match

* [hpx] Backport boost 1.69 fixes

* [libtorrent] Clean up cmake file installation

* [boost-type-traits] Fix MSVC arm