better mobile support

[max-mapper]

for mobile controls there have been a few experimental modules written:

https://github.com/DamonOehlman/voxel-touch-hello-world
https://github.com/DamonOehlman/voxel-touchy
https://github.com/maxogden/fps-touch-controls
voxel-touchcontrols on npm

the main focus has been making voxel-engine fast, but not much work has been done to find out settings configurations that work well on mobile.

in voxel-engine you can pass some options that help with rendering:

chunkDistance: this controls how much of a radius around the player to draw at a given time, e.g. setting it at 1 draws 1 chunk in each direction. the lower this is the faster the game will run but the less of the world you'll be able to see

materialFlatColor: if set to true the game will use flat colored materials instead of textured materials which should render faster

[max-mapper]

moved to voxel/issues#2