Unit tests for Guide module
Refactor Interface and Story modules
Unit tests for some knowledge data
Modify move & stand mechanics
Move less, stand more
Modify population control mechanic
Increase giving birth chance instead of adding more people
Not show too much text in knowledge trending
Revert
Increase chance to reach 150 population
All knowldge except (the first one) have low priority by default
Fix typo
Fix #16
Prevent seed from stucking at the same position
Rename seed appearance to icon
Fix css icons
Add carrying mechanic
Double the value of decreasing in food resources
Add Language module