tetris in D in webassembly

[Adam D. Ruppe]

http://webassembly.arsdnet.net/

tetris.d source here: 
http://dpldocs.info/this-week-in-d/Blog.Posted_2020_08_03.html#tetris-in-d

web assembly source and explanation here:

http://dpldocs.info/this-week-in-d/Blog.Posted_2020_08_10.html


Short version: BARE MINIMUM druntime port to webassembly together 
with a bare minimum source port of simpledisplay.d to it as well 
made that little game playable.

In theory we could make a lot more work by building up one 
function at a time. In practice I gotta get back to real work so 
don't hold your breath :)