Cleanup Analysis Tools list of Plugins to only Supported Items

Currently Analysis Tool Plugin list has items not supported in latest i2b2 release code. Below items( will be reviewed and removed from the plugins list

Demographics (1 Patient Set) - Simple Counts
Demographics (2 Patient Sets) - Simple Counts
Workplace Items Sharing Enhancement - Searcher
CARE (Cohort Analysis & Refinement Expeditor) - Concept Demographics Histograms
CARE (Cohort Analysis & Refinement Expeditor) - Concept Observation Tally Demographics Histograms
ExportXLS
Development Example #4 - Communicator Tool