Make holonomic vehicles use new linear motion function

[ddengster]

New feature implementation

Implemented feature/bugfix

With changes in #54 ackermann steering vehicles had to use a different motion function that takes advantage of a target speed. This PR makes diff drive vehicles make use of the same function as well without no-move bugs.

Relevant changes are in 38f4bcf, the rest of the commits are based off fix/motion. The changes are done in this separate PR because this could break many of our other simulations.

[codecov]

Codecov Report

Merging #57 (38f4bcf) into main (5746ac7) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #57       +/-   ##
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  Coverage    0.00%   0.00%               
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  Files        2118     138     -1980     
  Lines      203555   13185   -190370     
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+ Misses     203555   13185   -190370     

Flag	Coverage Δ
tests	0.00% <ø> (ø)

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Impacted Files	Coverage Δ
...f_simulation/rmf_building_sim_common/src/utils.cpp
...lding_sim_ignition_plugins/src/crowd_simulator.hpp
...robot_sim_gazebo_plugins/src/TeleportDispenser.cpp
...ing_sim_gazebo_plugins/src/thumbnail_generator.cpp
...ation/rmf_robot_sim_common/src/readonly_common.cpp
...building_sim_common/src/crowd_simulator_common.cpp
...ing_sim_gazebo_plugins/src/thumbnail_generator.cpp
...f_simulation/rmf_building_sim_common/src/utils.cpp
...tion/rmf_robot_sim_gazebo_plugins/src/readonly.cpp
.../rmf_simulation/rmf_robot_sim_common/src/utils.cpp
... and 2234 more

[luca-della-vedova]

Closed via #71