Improve Profiler API.

Improve Profiler API.

* Add method Profiler:Wrap() to wrap Blizzard API functions and use it in
  various modules to profile usage of the Blizzard functions.

- Add method Profiler:GetProfilingGroup() to get the methods collection
  associated with a particular profiling group.

- Extend Profiler:RegisterProfilingGroup() to take two callbacks for
  group-specific enabling and disabling of profiling.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@1511 d5049fe3-3747-40f7-a4b5-f36d6801af5f