HOME, CLEARSCREEN/CS, DRAW, PENDOWN/PD, PENUP/PU, SETHEADING/SETH, SETX, SETY, SETXY.

Signed-off-by: cyberzhg <cyberzhg@gmail.com>
Merge branch 'master' into gh-pages
Add keywords.

Signed-off-by: cyberzhg <cyberzhg@gmail.com>