Student Folder method/property rework

[jahorton]

Some of the currently existing build warnings will be fairly difficult to fix without some minor changes to code organization for the StudentData class and its interactions with the LMSAssignmentManager interface. In particular, the isStudentFolderPresent method is part of the LMSAssignmentManager.

• Both StudentData and LMSAssignmentManager are generic and have related type parameters.
• Many uses of LMSAssignmentManager should be LMSAssignmentManager<?> - wildcarded.
  • This causes serious conflicts with attempts to wildcard StudentData... which should probably not be generic at all.

As a result, LMSAssignmentManager.isStudentFolderPresent should be reworked to StudentData.getStudentFolder. The LMSDataTag inner class/interface of LMSAssignmentManager could prove useful in rerouting the important functionality to facilitate this restructure.

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Alternatively, if it is possible to reasonably preserve the current generic specifications while being more precise in their use, that would be ideal.