default grid sync in settings

[drakh]

it will be nice to have default sync type for switching grid lines, it is a little bit annoying to setup each grid line in playlist for sync- i am using bars and the default is seconds...

and probably other modules which uses sync should be affected by this option too.

[senso]

we have to make a choice, since many users only use seconds as default sync.
another option in the setup is not suitable and will turn usine into a very complex soft with a huge set of options...