V0.0.8[*] & V2.1.2[+]

+Add goal data model CPlanGoal
+Add goal abstract widget CGoalTagWidget
+Add functions to save and load plan data(work space)
+Finish CPlan and CPlanTimeHour class, now the data model framework is
done(CPlan = CPlanGoal + CPlanTimeHour)
+Refine UI
+Fix bugs