Addition of ServerStats shared region module which collects and registers
server wide statistics (CPU%, network bytes sent, ...) with StatsManager.
Modify StatsManager so console command "show stats category container"
only outputs the statistics in the specified container in the category.
Add EventHistogram.GetHistogramAsOSDMap that returns that parameters
about the histogram as well as the values.
Make StatsManager default output a little more readable
Streamline stat registration code in ServerStats. Remove most of the
usage of ProcessCounters which tend to fail oddly and are not supported
everywhere.
Add StatsManager registration for region specific stats as collected
by MonitorModule. Left existing functionality (command line and HTTP
fetch) and just added StatsManager registration.