Beta release!

[25.01.2019]

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- rolled back the UI changes;
- started working on the unlockable modes.

[29.01.2019]
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- implemented unlockable modes;
- started working on the Achievements page.

[30.01.2019]
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- implemented achievement backend logic.

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[11.02.2019] - CLOSED BETA VERSION!
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- implemented Achievement menu and pagination logic;
- font switched to Roboto;
- fixed achievements showing up even when they have been marked as seen in the Achievement menu;
- fixed achievements not being saved properly;
- increased speed of error animation on flipped cards;
- added a reset script for stat-tracking.

[11.10.2019]
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- build version is now displayed properly in every menu;
- timebar color is now constant default orange;
- grey-mode related achievements are now hidden;
- achievements re-sorted on the achievements screen;
- only visible achievements can produce sound on mouse-over.

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[12.10.2019] - BETA VERSION!
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- fixed the system time object placement in every room;
- version is now displayed only on the Settings screen;
- made a simple game trailer.