refactor/session_aware

- remove mk1 clock timer (move to mk1 plugin)
- remove skill_api methods
- make session aware (timezone, time_format, date_format)
- use datetime utils from ovos-utils, dont make UTC assumptions (or at least let all tz assumptions be made in that module)

README.md

@@ -4,10 +4,8 @@ Get the time, date, day of the week
 ## About 
 Get the local time or time for major cities around the world.  Times
 are given in 12-hour (2:30 pm) or 24-hour format (14:30) based on the
-Time Format setting at [Home](https://home.mycroft.ai/#/setting/basic)
+Time Format setting in your `mycroft.conf`
 
-Time can optionally be shown on a display, like a digital clock.  See
-the [Skill Setting](https://home.mycroft.ai/#/skill).
 
 ## Examples 
 * "What time is it?"