Canvas bug fix and POSIX param

• New Manual Posix param to avoid the timezoned.rop.nl ezTime's timezone service. Thanks @JeffWDH!
• Set time.google.com as a default NTP server - pool.ntp.org is a slug
• A bug in the Canvas clockface - Commit a216c29c4f15b1b3cadbd89805d150c2f551562b