CubeGenerator replace by cube' state_hidden to recycle cube and avoid remove/add entity in the 3D (and regeneration of shader)
hack to avoid NPE
remove effects (now part of library html_toolbox)
set version 0.18.0-dev
ignore build directory
upgrade dependencies
use custom progress bar and include level/webgl
initialisation into the bar
try to manage vdrone via state (fsm) instead of
 create + delete (to avoid re-create + recompile
 shader, require to know every object)
follow changes in glf
gui: move energy
gui: add basic +1 notification when grab a cube
result: change the display of the formula
up the camera +2 (on z axis)
hud: minor adjustment
renderer: enable fxaa + brighness/contrast/gamma
rename alias Math2 to math2
remove lib/html_tools.dart
experiment custom shade
try to rotate cube with quaternion (failed)