[Plot] Add plots back into Eclipse launch

Add plot plugin back into Eclipse launch, to
ease development of MCT-3881 (and because
it should not have been removed to begin with.)
[Plot] Add missing license headers.
[Plot] Add combo box for feed type selection

Add combo box to select the type of feed to
be used for plotting, for MCT-3881.

Additionally, remove some unused code in the
same file to clear out warnings.