nsIComponentRegistrar.
2. Converts callers of nsComponentManager::AutoRegister to use
nsIComponentRegistrar's autoRegistrar method.
3. Add nsIComponentRegistrar implmentation to nsComponentManagerImpl.
4. Rearrange nsComponentManager.cpp so that related methods are in the same
place.
5. Added a C-style function NS_GetComponentRegistrar so that getting the
registrar is easier in some places.
6. Added a nsISimpleEnumerator interface on PLDHashTableEnumeratorImpl. in
this way, the same base class can support both old style and new style
enumerations.
7. Fixed a nasty bug where unregistring factories will leave the contract id
hash with a dangling pointer. Now, when unregister is called we search the
contract id hash for entries which have the given doomned cid and remove them.
Bug 115853. r=dp@netscape.com, sr=rpotts@netscape.com
