Search archives in multiple feeds (#233)

* Inline regex string

* Remove unused binFolderRelativePath

* Add feedcredential validation function

* Move initializations below functions

* Get architecture cleanup

* Rename latest version file parse method

* Move dryrun output into separate function

* Split aka.ms failure case

* Small cleanup

* Convert AzureFeed to a list

* Generate all links before downloading

* Use generated links to download

* Error when no links were constructed

* Update checks on already installed

* DryRun should happen before installation check

* Fix credential validation

* Fix wrong variable usage

* Move aka.ms stuff into function

* Clean up

* Determine installation root earlier

* Try multiple feeds

* Small fixes

* Failures during download shouldn't write to stderr

Some download errors are expected. They dont signal a problem.

* Bug and test fixes

* curl shouldn't output to std err

* Print generated links for debugging

* Added tests

* Test Fixes

Author: bekir-ozturk