Fully functional 2D ROS real-time extension

[judicaelclair]

Fully implemented the 2D ROS real-time extension. Only thing remaining is to implement extended walls in OccupancyGridMap, but this is not a ROS-related issue.

• PersistentState is shared across all Services instances. This is required for multiple runners.
• Externally syncing agent position, disabling any editing by the visualiser. This is used by ROS to keep a live position of the agent.
• Removed simulator_grid_display from Configuration as it isn't useful anymore.
• Tracking removed display, and general rendering pipeline polish for correct nested-runner rendering. WayPointNavigation now renders properly.

[codecov-io]

Codecov Report

Merging #62 (7f08b3c) into master (d4a4a90) will decrease coverage by 0.04%. The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   82.50%   82.46%   -0.05%     
==========================================
  Files          67       68       +1     
  Lines        3316     3331      +15     
==========================================
+ Hits         2736     2747      +11     
- Misses        580      584       +4     

Impacted Files	Coverage Δ
src/simulator/services/services.py	49.16% <16.66%> (-1.27%)	:arrow_down:
src/structures/point.py	79.45% <55.55%> (ø)
src/utility/process.py	87.50% <87.50%> (ø)
tests/test_graphics/common.py	91.42% <100.00%> (+0.08%)	:arrow_up:
tests/utils.py	82.85% <100.00%> (+0.85%)	:arrow_up:

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