lib: intro the a_star module (even though it is not yet A*)

Still need to support the heuristic.

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro the bucketed_game module, providing basic game logic

Used by LoL and Nit forest simulator.

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: adds sqrt, sin and cos to Int

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>