INSTALL_PATH with spaces

[janosch1 at mailbox.org]

> Am 06.03.2021 um 02:17 schrieb Ryan Schmidt <ryandesign at macports.org>:
> 
> I would abandon this attempt because a port shouldn't be installing anything in a user's $HOME. Ports should accommodate being installed by one user but being used by another user, for example. And the user account we use on our build server is unlikely to be the same as the user account that the user is using.
> 

You are of course right about not installing anything into $HOME. I changed the port to install into /Library/Application Support/MacPass and also changed the „parent“ app MacPass to load plugins from this location.

If I were a seasoned Objective-C developer I would have changed the path to something below ${prefix}. If I find time to dig deeper into Objective-C I will do that, but for the time being I think /Library/Application Support is good enough.

The PR for the new port MacPassHTTP is here: https://github.com/macports/macports-ports/pull/10162