* Fix a buglet in the session module
* Make some renames in the session module - avoid having a function called 'delete'
so that we don't piss any C++ compilers. Also rename the {startup,s

* Fix a buglet in the session module
* Make some renames in the session module - avoid having a function called 'delete'
so that we don't piss any C++ compilers. Also rename the {startup,shutdown}_globals
to {startup,shutdown}_session_globals, so that they're a bit less general names,
and made them static.
* Remove uselss variables

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- some cleanups
- add gc logic
- add session_destroy()

- s/encoded/encode/
- new TODO entry

first import of session module