Add RC3 release changes

[PaulHigin]

These changes to the following:

• Remove the -Force parameter from Set-SecretStoreConfiguration cmdlet. The -Confirm:$false parameter should now be used to prevent PowerShell from prompting for confirmation.

• Add -Password parameter to Set-SecretStoreConfiguration cmdlet. This new parameter allows a password to be passed in as a cmdlet argument so that prompting is not needed.

• Fix the manifest license Url.

• Update and fix help files. Help files were not compiling into xml correctly before.

[anamnavi]

LGTM, thanks for adding me to this PR! It was helpful to see Reset-Store (and I'll look further into that for PSGet as we discussed) and ?? (the null coalescing operator- I didn't know that existed)