Update 1.6.7b

This update covers four days in Artyom's life (from 22 to 25). For now, I have set the update number to 1.6.7b. When I prepare the remaining 3 days to complete the week, I will think about a normal and understandable numbering. The update contains about 2,200 lines of dialogs, more than 1,000 renders, and more than 20 animations.