add recordboard
add ending function in challenge.lua
set_visible() functon -> show() & hide() function in recordboard.lua
add title_ in recordboard.lua
adjest time record visible
fix time record save wrong in challenge.lua line 90~94
remove submode==0 script from demo.lua to challenge.lua
submode adjust & show record when single game end
save record use string
add remove_cb() in ask box