Teleop: Refactor and support vertical

[chapulina]

🎉 New feature

Summary

Adds controls for vertical linear velocity for the teleop plugin. Also made the twist topic configurable from the XML.

I had to refactor quite a bit of code to make the implementation a bit cleaner.

Test it

ign gazebo -r multicopter_velocity_control.sdf

ign gazebo -r diff_drive.sdf

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

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[codecov]

Codecov Report

Merging #440 (489414b) into ign-gui3 (fa98615) will increase coverage by 0.46%.
The diff coverage is 96.05%.

❗ Current head 489414b differs from pull request most recent head 1c3e5ef. Consider uploading reports for the commit 1c3e5ef to get more accurate results

@@             Coverage Diff              @@
##           ign-gui3     #440      +/-   ##
============================================
+ Coverage     66.42%   66.88%   +0.46%     
============================================
  Files            29       29              
  Lines          3291     3310      +19     
============================================
+ Hits           2186     2214      +28     
+ Misses         1105     1096       -9     

Impacted Files	Coverage Δ
src/plugins/teleop/Teleop.hh	100.00% <ø> (ø)
src/plugins/teleop/Teleop.cc	92.02% <96.05%> (+8.83%)	⬆️

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[jennuine]

LGTM, some minor comments

Could we add a stop button for the sliders tab (would set forward, velocity, and yaw vel to zero)?

[chapulina]

Could we add a stop button for the sliders tab (would set forward, velocity, and yaw vel to zero)?

Done 1c3e5ef