Fix typo.
Add shell files for the particles scripting library.
Add some foundation code for particle systems.
Remove the old metadata system from materials.
Fix typo.
More foundation work on particles and the particle editor.
More groundwork for the particle editor.
More early work on the particle editor.
A minor refactor.
Reorganization.
More groundwork for particles.
Initial work on rendering particles.
Have the particle system face in the direction of the attached scene node.
Have the scene node in the particle editor face +Y by default.
More work on particles.
Add some emission shapes to particle emitters.

This does not include editor support.
Add ability to change the values of a particle system via the editor.
Get burst mode working with particles.
Use malloc/free instead of new/delete.
Add support for changing the emission shape of a particle emitter via the editor.