Fix compiler warnings [SWS-918]

[gregturn]

Philippe Marschall opened SWS-918 and commented

The project contains various easy to fix compiler warnings like unused imports, raw types and no longer needed @SuppressWarnings("unchecked").

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Referenced from: commits de1e640

[gregturn]

Philippe Marschall commented

Pull request:
#37
for some reason I don't seem to be able to link it