add Player to Game for shared access
rename PlayerCharacter to Player
move the map with the player sprite
render one tile past the display for offset
handle moving to the map's far edges
move the debug grid with the map
include the unit in the name
smoother movement
:lipstick: move code to better places
fix grid scrolling
DRY up grid line position calculation
don't calculate display stuff each frame
don't calculate map terminus each frame
Merge pull request #9 from half-ogre/half-ogre/1-move-the-world

As the player moves, so to should the view of the world