hplot: Changed the way HInfoStyles work, and added HInfoStdDev
Created by: decibelcooper
Previously, there seemed to be an incorrectly configured set of constants enumerating the different styles, and incomplete code for adding info to the legend. The enumeration has been changed to be bitset-like, and the code that adds the info to the legend now iterates over the bits, allowing the bitwise ORing of styles.
Additionally, HInfoStdDev has been added to the style enumeration, and it replaces HInfoRMS as one of the styles OR'd for HInfoSummary.
Finally, HInfoStyle has been changed from int to uint32.