stats.lua: add options to disable the graphs on page 3

[verygoodlee]

we can disable all other graphs except page 3, graphs are quite heavy to render, in some cases they cause frame drops.

Expected behavior of the wanted feature

add options to disable the graphs on page 3

Alternative behavior of the wanted feature

N/A

Log File

N/A

[Andarwinux]

The right way is to disable stats. the long term solution is to improve libass or find a alternative, libass is just too slow at the moment.

[Andarwinux]

multithreaded libass seems to improve this. For me, msg-level=all=debug, video-sync=display-vdrop with console and stats page 4 enabled still get fairly stable fps.