TODO: 2018.3 prefab system change

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2018.3 version of unity has changed behavior of prefab system, including PrefabUtility, which is heavily used for prefab root detection. Needs to be cleaned up and modified.

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Related:

Assets\ExodusExport\Scripts\Editor\Exporter\ExportUtility.cs(31,15): warning CS0618: 'PrefabUtility.FindPrefabRoot(GameObject)' is obsolete: 'Use GetOutermostPrefabInstanceRoot if source is a Prefab instance or source.transform.root.gameObject if source is a Prefab Asset object.'
Assets\ExodusExport\Scripts\Editor\Exporter\ExportUtility.cs(36,19): warning CS0618: 'PrefabUtility.GetPrefabType(Object)' is obsolete: 'Use GetPrefabAssetType and GetPrefabInstanceStatus to get the full picture about Prefab types.'
Assets\ExodusExport\Scripts\Editor\Exporter\ExportUtility.cs(37,21): warning CS0618: 'PrefabType' is obsolete: 'PrefabType no longer tells everything about Prefab instance.'
Assets\ExodusExport\Scripts\Editor\Exporter\ExportUtility.cs(37,61): warning CS0618: 'PrefabType' is obsolete: 'PrefabType no longer tells everything about Prefab instance.'
Assets\ExodusExport\Scripts\Editor\Exporter\ExportUtility.cs(40,21): warning CS0618: 'PrefabType' is obsolete: 'PrefabType no longer tells everything about Prefab instance.'
Assets\ExodusExport\Scripts\Editor\Exporter\ExportUtility.cs(40,69): warning CS0618: 'PrefabType' is obsolete: 'PrefabType no longer tells everything about Prefab instance.'
Assets\ExodusExport\Scripts\Editor\Exporter\Utility.cs(45,11): warning CS0618: 'PrefabUtility.FindPrefabRoot(GameObject)' is obsolete: 'Use GetOutermostPrefabInstanceRoot if source is a Prefab instance or source.transform.root.gameObject if source is a Prefab Asset object.'
Assets\ExodusExport\Scripts\Editor\Exporter\Utility.cs(49,19): warning CS0618: 'PrefabUtility.GetPrefabType(Object)' is obsolete: 'Use GetPrefabAssetType and GetPrefabInstanceStatus to get the full picture about Prefab types.'
Assets\ExodusExport\Scripts\Editor\Exporter\Utility.cs(50,24): warning CS0618: 'PrefabType' is obsolete: 'PrefabType no longer tells everything about Prefab instance.'
Assets\ExodusExport\Scripts\Editor\Exporter\Utility.cs(54,19): warning CS0618: 'PrefabUtility.GetPrefabType(Object)' is obsolete: 'Use GetPrefabAssetType and GetPrefabInstanceStatus to get the full picture about Prefab types.'
Assets\ExodusExport\Scripts\Editor\Exporter\Utility.cs(55,24): warning CS0618: 'PrefabType' is obsolete: 'PrefabType no longer tells everything about Prefab instance.'
Assets\ExodusExport\Scripts\Editor\Exporter\Utility.cs(59,19): warning CS0618: 'PrefabUtility.GetPrefabType(Object)' is obsolete: 'Use GetPrefabAssetType and GetPrefabInstanceStatus to get the full picture about Prefab types.'
Assets\ExodusExport\Scripts\Editor\Exporter\Utility.cs(60,24): warning CS0618: 'PrefabType' is obsolete: 'PrefabType no longer tells everything about Prefab instance.'
Assets\ExodusExport\Scripts\Editor\Exporter\Utility.cs(60,64): warning CS0618: 'PrefabType' is obsolete: 'PrefabType no longer tells everything about Prefab instance.'