* Move autoloader up in Maintenance as well
* Add setInstance() method to Profiler, dumpHTML will need it
* Move get/setProfileId() up a level to Profiler. ProfilerSimple subclasses use it, behavior is harmless for Stub.
* Move autoloader up a little bit so the profiler classes can use it
* Make Profiler into a singleton so it's lazy-constructed, $wgProfiler is now a configuration array (used 'visible' in ProfilerSimpleText as an example of other globals we can move into this array). If $wgProfiler is set to an object, it'll use that for back-compat
* Maintenance: rather than setting up the profiler and then disabling it, just disable it from the start
* Kill $wgProfiling -> now that ProfilerStub overrides profileIn() and profileOut(), it's not needed
* dumpHTML needs some fixes still
* Move them all to includes/profiling/* - If you're using StartProfiler, you'll need to update that
* Make ProfileStub subclass the Profiler rather than duplicating function definitions conditionally
* Removed unused params to wfGetProfilingOutput(), only used in the stub, and they didn't do anything with them
* TODO: Kill $wgProfiling, make $wgProfiler a config array and move the various options to that. Also make into a singleton, rather than global (not much calls it outside of core)
