Update 0.1.8.1

New features, improvements and fixes:

- Light maps and scene loading system. Very big performance boost, new light and new shadows, but there are graphical artifacts

- Quick access button to lessons in school. Lesson interface has been improved. Lessons change depending on time.

- You can start working only after 14 hours.

- Partial translation of the interface into Russian.

- Many minor fixes and changes.