Add SAGA GIS

[realmiketalbot]

Attempting to publish a package of version 7.2.0. None of the silent arguments I've tried have yet worked, including:

• '/S'
• '/s /v"/qn"'
• '/norestart /qn'

[realmiketalbot]

These arguments appear to work:

• '/VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP-'

However, choco uninstall is not working. There appears to be a separate executable for uninstallation.