added tabs to the tty

modules/drivers/tty.lua

@@ -17,6 +17,7 @@ function tty(gA,sA,sI,fg,bg)
    if c == "\n" then cx,cy=1,cy+1
    elseif c == "\r" then cx=1
    elseif c == "\f" then cx=1 cy=1 gP.fill(1, 1, sx, sy, " ")
+   elseif c == "\t" then cx=cx+4-((cx+4)%4)
    elseif c == "\127" then cx=cx-1 gP.set(cx,cy," ")
    else gP.set(cx,cy,c) cx=cx+1 
    end cv()