Preparation for View implementation.
Sprite template, cocos scene, file reorganisation.
Clean up and refactoring - constness of Game_logic accessors
View creation and integration with cocos scene.
Accumulator sprite template spec. [in progress]
Blocks are now represented by unique_ptrs instead of shared_ptrs.
View updated to work with logic.
Handling of events in View primary design.
Display of accumulators and adding blocks.
Unique_ptr's instead of raw pointers in Game_sprite<Accumulator>.
Addition and removal of blocks into accumulators by clicking on the screen.
Some refactoring, board sprite class addition.
Blocks added to board by clicking [in progress].
Blocks added to board by clicking - done.
New board graphics fitting smaller blocks.