Logic added for client-side Somaria decoding

When Somaria (an Advanced Data Visualization control) was used with Predictor Performance, the special characters were displayed as ASCII values instead of the actual values in the label. This was traced to Somaria encoding special characters of the visualization data into HTML entities on the server in order to protect against cross-site scripting attacks, but these entities were not being decoded on the client side. To resolve this, logic has been added to decode HTML entities in Somaria data on the client.