Restructure installer.
- Restructured the installer so users can import modules by name
- Adjusted the shortcut execution policy logic to inherit the user/machine policy
- Change PowerShell path to use registry defined value instead of hard-coded path
- Added BuildInstaller.ps1 to automatically regenerate and build the Azure PowerShell installer.
Merge branch 'dev' of github.com:Azure/azure-sdk-tools into module
Fix test settings
Merge pull request #2455 from ogail/module

Restructure installer.