TODO.release

TODO before the next release (Sear 0.6.3)
 
 * Make sure contextDestroyed and contextCreated are properly implemented in all
   classes and used correctly. James still reports some problems. Fixed with 
   latest sage?

 * Make sure GUI is cleaning up correctly. -- Mostly done now.
 
 * Finish appearance/entity mapping code. Depends on what attributes are set on
   the server.

 * Finish up current render queue work. DynamicObjects need converting and we
   need a seperate transparency queue. Perhaps we can build a priorityqueue 
   comparison function to do the required sorting.

Other things todo in the slightly longer term (sear 0.7!)

 * libwfut is coming along. It would be good to be able to download media as it
   is required and update if required.
   - Need to be able to tell various bits of sear that a file has been updated
     so reload what ever it is associated with.
     - Textures just need to unload previous and reset internal ID. (This might
       break any display lists and the texture object id will change)
     - Harder for models as they are represented by multiple files
     - Might need a class that stores a reference between objects and the files
       it uses. E.g. 3ds_tree->tree.3ds, tree.vconf, tree.png. The updater can
       tell the handler that the file is updated, that in turn can tell the 
       object. Probably can be done with some good signal usage.
   - Need to separate media into chunks associated with a particular entity.
   - Or download all config files on startup, and grab media files as and when
     they are required.
   - Need to be able to search for a file in a number of locations (different
     prefixes). E.g. $PREFIX/sear-media/.... or ${SEAR_CACHE}/sear-media/...

 * Once the Static/Dynamic objects have been finished, the render queues need 
   to be built around them instead of the models. Two queues need to be made.
   One for transparent objects (sorted by Z order) and one for opaque objects
   (sorted by texture/state/similarity). This will place Sear in a much better
   position to use more advanced rendering stuff.
   - At some point it will be necessary to move the render function in 
     StaticObject to a higher level component that can see that subsequent 
     objects differ only in position and so do not need VBO buffers to be
     unbound and then rebound.
   - A "visual" bounding box will be needed around each mesh so that clipping 
     can be done per mesh as well as per object.