A few renames.

OFExceptions:
 * OFNoMemException to OFOutOfMemoryException.
 * OFMemNotPartOfObjException to OFMemoryNotPartOfObjectException.

OFObject:
 * -[addItemToMemoryPool:] to -[addMemoryToPool:].
 * -[allocWithSize:] to -[allocMemoryWithSize:].
 * -[allocNItems:withSize] to -[allocMemoryForNItems:withSize:].
 * -[resizeMem:toSize] to -[resizeMemory:toSize:].
 * -[resizeMem:toNItems:withSize:] to
   -[resizeMemoryToNItems:withSize:].
 * -[freeMem] to -[freeMemory:].

OFString:
 * -[urlencode] to -[urlEncodedString].
 * -[urldecode] to -[urlDecodedString].