There is no need to duplicate the method/signal/property arrays that
were registered for objects. The registration was using static arrays
on methods/signals/properties in all places and we can as well use
those throughout without having to allocate memory and copy all the
entries for every object. This reduces number of allocations and
amount of unnecessary code quite a bit.
There is no need to go through methods, signals, and properties in
two loops and only collect interfaces in the first run. Get rid of
unnecessary CPU use by generating the XML data for interfaces with
a single pass.
The XML used in D-Bus introspection is simple and there is no need to use
libxml2 to generate it. This gets rid of the dependency on the large
library by using internal XML generation.
Simpler to use for loops instead of handling next pointer selection
in all places. In addition, couple of functions could have ended up
in an infinite loop on error path since the pointer update was missed.
