Optimized events pushing

This also resolves a memory leak that was occurring on staging, probably
due to an event handler never being removed from the event object
(disposed). Removed usage of the helper Request class, which is all but
deprecated. Now writes serialized content directly to the http stream
avoiding the large object heap if lots of events occur at the same time.
Marked Procon.HTTP.Request as Obsolete

This class was useful to download files easily that required us to show
the user running stats on the download, but over half the class isn't
being used in Procon. It's easier to just implement WebRequest in the
classes that currently use it than rely on this class.