Better times module (#6552)

* First work on better timezones

* Update tests to new api.
Removed tests for checking that `isDst` was included when formatting, since `isDst` no longer affects utc offset (the entire utc offset is stored directly in `utcOffset` instead).

* Deprecate getLocaltime & getGmTime
* Add `now()` as a shorthand for GetTIme().inZone(Local)
* Add FedericoCeratto's timezone tests (#6548)
* Run more tests in all timezones

* Make month enum start at 1 instead of 0
* Deprecate getDayOfWeekJulian
* Fix issues with gc safety
* Rename TimeInfo => DateTime
* Fixes #6465
* Improve isLeapYear
* FIx handling negative adjTime

* Cleanup:
- deprecated toSeconds and fromSeconds, added fromUnix and toUnix instead (that returns int64 instead of float)
- added missing doc comments
- removed some unnecessary JS specific implementations

* Fix misstake in JS `-` for Time

* Update usage of TimeEffect
* Removed unecessary use of `difftime`
* JS fix for local tz
* Fix subtraction of months
* Fix `days` field in `toTimeInterval`
* Style and docs
* Fix getDayOfYear for real this time...
* Fix handling of adding/subtracting time across dst transitions
* Fix some bad usage of the times module in the stdlib
* Revert to use proper time resoultion for seeding in random.nim
* Move deprecated procs to bottom of file
* Always use `epochTime` in `randomize`
* Remove TimeInterval normalization
* Fixes #6905

* Fix getDayOfWeek for year < 1
* Export toEpochDay/fromEpochDay and change year/month/monthday order
* Add asserts for checking that the monthday is valid
* Fix some remaining ambiguous references to `Time`
* Fix ambiguous reference to Time

lib/pure/ioselects/ioselectors_kqueue.nim

@@ -452,10 +452,10 @@ proc selectInto*[T](s: Selector[T], timeout: int,
 
   if timeout != -1:
     if timeout >= 1000:
-      tv.tv_sec = (timeout div 1_000).Time
+      tv.tv_sec = posix.Time(timeout div 1_000)
       tv.tv_nsec = (timeout %% 1_000) * 1_000_000
     else:
-      tv.tv_sec = 0.Time
+      tv.tv_sec = posix.Time(0)
       tv.tv_nsec = timeout * 1_000_000
   else:
     ptv = nil