Randomly shrouds cells of the map.
Removes the shroud when moving units around
Increases view range of units to 5 tiles.
Removes shroud around all units at the start of the game.
Add tasks for shroud feature to make 'acceptance criteria' more clear
Circular shroud radius
Merge pull request #10 from pdl/feature/explore-by-clearing-shroud

Circular shroud radius
add another requirement because shroud is useless without it
Merge branch 'master' into feature/explore-by-clearing-shroud

Conflicts:
	unit.cpp
Moves view range into unit.cpp to prepare for different view ranges.
Enables configurable view range per unit
Improves circular shape of view range.
Renames Cel::shrouded field to conform to naming convention.
convert between world and map coordinates in map class because we apply
DRY
update readme so we have a clear overview what is left to do
Things with an 'enemy' are now in a separate feature to keep things simple for this feature
Add shroud graphics
when init returns false quit game so the user is not confronted with seg
faults
- shroud has now smooth edges
- add another requirement for this feature
- moved tileset to graphics directory, and removed it from root
drop a shadow at the edges of the shroud to give a 'foggy transition' to
the unknown and undiscovered universe of Dune.