Split time zones from ceylon.time into a separate module

[luolong]

Since ceylon.locale and ceylon.time both need to have access to time zone information, we should split most of the time zone related classes away from ceylon.time library into a separate module.

Suitable module name would be ceylon.timezone?

[gavinking]

Well locale needs a dependency to time anyway so what is the advantage?

[luolong]

how so -- as far as I know, the only reason they need dependency on ceylon.time is because of time zones?

[gavinking]

Nope. All the methods for formatting dates and times.

[luolong]

ah, for some reason I thought that was in ceylon.format...