Function parsePackageInfo

Parses the actions in package-info.xml file from packages.

package should be an xmlArray with package-info as its base.
testing_only should be true if the package should not actually be applied.
method can be upgrade, install, or uninstall. Its default is install.
previous_version should be set to the previous installed version of this package, if any.
does not handle failure terribly well; testing first is always better.

Package: SMF
Copyright: 2020 Simple Machines and individual contributors
License: BSD
Author: Simple Machines https://www.simplemachines.org
Located at Sources/Subs-Package.php

Parameters summary
`xmlArray`	`& $packageXML`	$packageXML The info from the package-info file
`boolean`	`$testing_only = true`	Whether we're only testing
`string`	`$method = 'install'`	The method ('install', 'upgrade', or 'uninstall')
`string`	`$previous_version = ''`	The previous version of the mod, if method is 'upgrade'

Return value summary
`array`	An array of those changes made.

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Function parsePackageInfo