Added SQLite NuGet packages
Added counter function
    - Renamed Form1 to MainWindow
    - Added a cool counter function :)
Added some changes to the main window
    - Added an editor of the current pomodoro
    - Added Log button and a new Log window
    - Added DataManager class and CreateDBOrSkip() method
Added entry list and save entry function
    - Added entry list to the LogWindow
    - We can save our entry from now to DB
Added some function to LogWindow
We can delete an entry from now.
We can add tags to entries from now.
Added export function.
Added ConfigManager
    - (a.k.a XML import/export function)