Dvc

* updater: detect conda (2679) n3hrox
* fix PR template to mention recommendatory nature of CC and DS (2723) shcheklein

1) [Refactored URLInfo-related logic](https://github.com/iterative/dvc/pull/2707);
2) [Added support for moving between different drives for SSH remotes](https://github.com/iterative/dvc/pull/2709);
3) [Removed "Multi-threaded" prefix from progress bars](https://github.com/iterative/dvc/issues/2686); Kudos kurianbenoy :tada:
4) [Added unit tests for `get_mtime_and_size`](https://github.com/iterative/dvc/pull/2698); Kudos algomaster99 :tada:
5) [Removed cask installation detection](https://github.com/iterative/dvc/issues/2680); Kudos ATR-oCiTy :tada:
6) Fixed typos: https://github.com/iterative/dvc/pull/2712, https://github.com/iterative/dvc/pull/2713, https://github.com/iterative/dvc/pull/2714, https://github.com/iterative/dvc/pull/2717, https://github.com/iterative/dvc/pull/2716, https://github.com/iterative/dvc/pull/2715; Kudos Pandemic179 eshaan-jeckyll ATR-oCiTy the-thirteenth-star GeorgeSabu-mec johntharian :tada: :tada: :tada:
7) [Added pkg manager to `dvc version` output](https://github.com/iterative/dvc/pull/2722); Kudos kss682 :tada:
8) [Stopped printing multiple "Need help?" footers when encountering multiple exceptions](https://github.com/iterative/dvc/pull/2674); Kudos n3hrox :tada:

1) [Introduced additional tests for s3 ETags](https://github.com/iterative/dvc/pull/2695);
2) [Removed obsoleted warning](https://github.com/iterative/dvc/pull/2693); Kudos sadielbartholomew :tada:
3) [Fixed bug in `dvc get-url`](https://github.com/iterative/dvc/pull/2705);

1) [Added additional unit tests for fs utils](https://github.com/iterative/dvc/pull/2673);
2) [Temporarily hidden `--all-commits` flag for `gc`](https://github.com/iterative/dvc/pull/2682);
3) [Refactored backtics and single-quotes usage in the code](https://github.com/iterative/dvc/pull/2644);
4) [Added a workaround for flufl.lock bug](https://github.com/iterative/dvc/pull/2688);
5) [Fixed bug when pulling imported directories](https://github.com/iterative/dvc/pull/2692);

1) [Reverted `path.lstrip("/")` patch for `dvc get/import`](https://github.com/iterative/dvc/pull/2651)

1) [Initial UI improvements for `dvc add`](https://github.com/iterative/dvc/pull/2546);
2) [Add support for S3 directories as external deps/outs](https://github.com/iterative/dvc/pull/2619);
3) [Exclude dvc/utils/compat.py from DeepSource analysis](https://github.com/iterative/dvc/pull/2670); Kudos sanketsaurav :tada:
4) [Dynamically adjust chunk_size when uploading to Google Cloud Storage](https://github.com/iterative/dvc/pull/2661);