support more resolution

[sugizo]

image below is standard stone width = 22 (when upload to youtube it detect sd)

image below when set standard stone width = 55 (when upload to youtube it detect hd)

problem

1. the image quality can't go more than hd quality when upload to youtube, already test set stone width = 220 and 999,
   the result is same goes to hd quality, the file size is same when set stone width = 220 and 999 (with the same *.sgf source file)
2. when set the stone width, why the fonts size on coordinate and move number goes smaller ?

expectation

1. image quality can goes higher than hd
2. the fonts size will adapt to stone width so it still can be read

best regards