Add NavigationStyle trait

[Sid-Bhatia-0]

1. Add new direction type Center
2. Add AbstractNavigationStyle trait
   1. Add DirectedNavigation (uses actions MoveForward, TurnLeft, TurnRight)
   2. Add UndirectedNavigation (uses actions MoveUp, MoveDown, MoveLeft, MoveRight)
3. Deprecate DirectionLessAgent
4. Replace BitArray{3} with AbstractArray{Bool, 3} at several places.
5. Cleanup Sokoban
6. Cleanup rendering. No need of specialized Makie rendering for Sokoban
7. Some minor changes and fixes

[codecov-io]

Codecov Report

Merging #116 (55cc267) into master (a31a234) will increase coverage by 0.37%. The diff coverage is 58.75%.

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
+ Coverage   79.71%   80.09%   +0.37%     
==========================================
  Files          17       17              
  Lines         848      864      +16     
==========================================
+ Hits          676      692      +16     
  Misses        172      172              

Impacted Files	Coverage Δ
src/actions.jl	100.00% <ø> (ø)
src/directions.jl	100.00% <ø> (ø)
src/makie_rendering.jl	0.00% <0.00%> (ø)
src/objects.jl	35.71% <0.00%> (+0.83%)	:arrow_up:
src/terminal_rendering.jl	0.00% <0.00%> (ø)
src/abstract_grid_world.jl	80.88% <47.82%> (+3.95%)	:arrow_up:
src/envs/doorkey.jl	98.83% <50.00%> (-1.17%)	:arrow_down:
src/grid_world_base.jl	91.66% <88.23%> (-3.46%)	:arrow_down:
src/envs/sokoban/sokoban.jl	98.71% <95.00%> (-1.29%)	:arrow_down:
src/envs/emptyroom.jl	100.00% <100.00%> (ø)
... and 2 more

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