bup-cron: refactor GlobalTimer into Timer
bup-cron: refactor GlobalTimer into Timer

Timer does not need to be a singleton. It is only used from main().
And remove init() since it would only initialize GlobalLogger.

Signed-off-by: Patrick Rouleau <63d5de1631bda7ef519bef8dad039f592a2f1542@gmail.com>

anarcat/bup-cron,anarcat/bup-cron,blueyed/bup-cron,blueyed/bup-cron