QuickFix: rename jss-autopkg-addon to JSSImporter
	- Only for install check & installer
Changed "jss-autopkg-addon" to "JSSImporter" in strings.
Refactor testInstallJSSImporter.
Refactor installJSSImporter.
Refactor runJSSImporterInstaller.
Refactor jssImporterUpdateAvailable.
Refactor jssImporterInstalled.
Refactor getJSSImporterVersion.
Refactor installJSSImporter.
Refactor LGJSSImporter.
Refactor JSSImporter.
Updated metadata for renamed files.
Refactor kLGJSSImporterInstalledLabel.
Refactor kLGJSSImporterNotInstalledLabel.
Refactor kLGJSSImporterUpdateAvailableLabel.
Refactor kLGErrorInstallJSSImporter.
Finished refactor.
Check for old and new version of JSSImporter.
Logical error. Thanks James.
Get old and new JSSImporter version. Also, you're welcome, Elliot. :)