Added --quiet parameter to download by file and id. (Backblaze#924)

* Aded --quiet parameter to download by file and id.

* Changelog fixed.

* Extended  --quiet flag to all commands

* Moved tests for file download to a separate file

* Improved unit tests

* Reorganize README.md: Separate section for global -h and --quiet flags.

* Correct typo in README.md: Change WAES256 to AES256.

* --noProgress is not needed with --quiet

* Formating improvements

* Reverted README.md to the version from master

* --quiet is now suppressed in help

* Formatting

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+* Add `--quiet` to all commands
+
 ### Infrastructure
 * Fix gathering licenses of typeshed libraries
 * Fix spellcheck erroring out on LICENSE file