CustomWidget now implements Region
fixed AddAlarm widget
added controller to TaskListLayout
fixed error in creation of reminder in AddTaskController
created function for saving and restoring reminder from DataSource
added create table statement for reminders, fixed foreign key name in table reminders
added registering of reminders in future on startup
fixed position of buttons in sidebar
field repeater id made non-nullable in table Tasks + removed one empty line in MainWindowLayout
removed duplication of parameters in function createIfNotExist
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Added controller to AddGoalLayout
Added controller to AddListLayout and AddContextLayout