Pressure/flow simulation in the fire/explosion engine?

[olofson]

Pressure/flow simulation, for shockwaves and the like...? This should be relatively simple to implement as physics acting on the particles, but I suspect it may also need to be implemented in the "fire effect" filter to look good.

(Related to #198.)

[clort81]

https://github.com/anirudhjoshi/fluid_table_tennis a nice implementation of the Stam fluid dynamics. also i notice your link to the pupnik n770/n800 kobo build is 404. I could grab the binary from archive.org if you want.