Issue 340 - Prefer Trusted Repositories

[awickham10]

This addresses a portion of issue #340.

• Get-PSRepository now returns trusted repos, then untrusted repos. They are also sorted alphabetically.
• Install-Module now does a Find-Module based on the parameters and if there are multiple repositories found, the first result is picked and set as the Source parameter for Install-Package.

Tests were added for both changes. I'm concerned that Find-Module will have a performance impact, but I'm not sure how else to do that check unless it's done at the PackageManagement\Install-Package function instead.

[alerickson]

Thanks for putting in this PR! I’ll take a look at it within the next couple days. Just wanted to give you an update

[awickham10]

Thanks for putting in this PR! I’ll take a look at it within the next couple days. Just wanted to give you an update

No rush, I'm obviously still working through some kinks 😅