* makes changes to almost all main repo files to be in accordance with .editorconfig
* some files in "test\fixtures\..." were left alone to avoid breaking tests
* NOTE: whitespace changes *only* (`git diff -b` shows no changes)
Migrate unzip_old tests to pester
Migrate packages tests to Pester
Migrate opts.ps1 to Pester
Migrate tests to use Pester idiomatic tests
Move tests.ps1 to Scoop-TestLib.ps1