Patch notes: v1.5.4

Patch notes v1.5.0 → v1.5.4: [list] [*]Added long break prompt after WORKing for long [*]Added a new "nature" alarm theme [*]Added a confirm dialog before deleting a pomodoro cycle [*]Added an explanation tip for pause budget [*]Added a shortcut to take screenshot (F10) [*]Added a piece of newsletter about keyboard shortcuts [*]Added a following mode (double click a citizen or animal) [*]Fixed a noncontinuous span bug [*]Fixed an ambient preview bug [*]Fixed a wrong icon on the reward view under dark mode [*]Improved the interface behaviour with a mouse wheel [/list]