- Added Pole and direction.
- Moving to north causes an exception in lambda goNorth() due to
map::at() function. Exception handling is needed.
On the way to the dynamic lambda-driven world.
- ShadowStructure, ShadowVariator is invented.
- 'Amber' shadow change is implemented.
- Presentation tip: shadow change can be wrapped into a small 'Changing
DSL'.
- Presentation tip: shadowstructure can be safe with some template
magic.