Log Message:
update to 0.10.22
changes:
GstController improvements
Extensions to the latency setting behaviours
Ability for plugins to register dependencies to trigger re-scanning
Optimisations in some common operations on caps and values and elsewhere
Add sequence numbers to events so dependent events can be associated
  with the event that caused them
New macros for reading and writing float values
Many improvements in the basesink base class
Support non-default main contexts for GstBus watches
Improvements in pull-mode scheduling of sinks
Fixes for alignment issues on sparc
Ghost pad fixes
New bit-reader assistance API
Many other bug fixes and improvements