Miscellaneous tidying of choose API, including:

- rename client and session to start_client and start_session in
  window_choose_data struct. also add TREE_OTHER define and reorder the
  struct
- rename window_choose_ctx to window_choose_data_run
- don't pass a cmd_ctx into window_choose_create (will let it use a
  different client later). instead take type, session, client
- add window_choose_data_free and use it to dispose of wcd rather than
  each cmd-*.c doing it individually
- change so ref counting is done by wcd_add and wcd_free rather than
  callers. this means 1 ref for each item but what of it :-)
- also add a ref to tree_session - not sure if this is needed?
- all the callbacks except choose-client and find-window are the same so
  remove them and add window_choose_default_callback
- reorder/rename some other bits and pieces for tidyness

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