file manager should handle file/folder exists with different case error

[abelhegedus]

The following error occurs when a directory with different case already exists (e.g. UML model name is model and changed to Model):

Caused by: org.eclipse.core.internal.resources.ResourceException: A resource exists with a different case: '/com.ericsson.emdw.cpp.generated.code.model/src/Model'.
    at org.eclipse.core.internal.resources.Resource.checkDoesNotExist(Resource.java:322)
    at org.eclipse.core.internal.resources.Resource.checkDoesNotExist(Resource.java:300)
    at org.eclipse.core.internal.resources.Folder.assertCreateRequirements(Folder.java:30)
    at org.eclipse.core.internal.resources.Folder.create(Folder.java:93)
    at com.incquerylabs.emdw.cpp.codegeneration.fsa.impl.EclipseWorkspaceFileManager.createFolder(EclipseWorkspaceFileManager.java:73)
    at com.incquerylabs.emdw.cpp.codegeneration.fsa.impl.EclipseWorkspaceFileManager.performDirectoryCreation(EclipseWorkspaceFileManager.java:87)
    at com.incquerylabs.emdw.cpp.codegeneration.fsa.FileManager.createDirectory(FileManager.java:412)

[abelhegedus]

This problem occurs when the root directory that is used by the file synchronization exists under a different case. Currently this only happens with the UML Model object.

[doczir]

Solving #462 would solve this issue.