Clean up various warnings caught by clang12

[mjcarroll]

Signed-off-by: Michael Carroll [email protected]

[codecov]

Codecov Report

Merging #1421 (33a4c9e) into main (f6ba375) will increase coverage by 0.00%.
The diff coverage is 14.81%.

@@           Coverage Diff           @@
##             main    #1421   +/-   ##
=======================================
  Coverage   62.34%   62.34%           
=======================================
  Files         317      317           
  Lines       24419    24417    -2     
=======================================
- Hits        15224    15223    -1     
+ Misses       9195     9194    -1     

Impacted Files	Coverage Δ
.../gui/plugins/transform_control/TransformControl.cc	7.36% <ø> (+0.01%)	⬆️
...lization_capabilities/VisualizationCapabilities.cc	3.66% <0.00%> (ø)
src/rendering/RenderUtil.cc	36.94% <0.00%> (ø)
src/systems/contact/Contact.hh	100.00% <ø> (ø)
src/systems/particle_emitter/ParticleEmitter.cc	55.40% <0.00%> (ø)
src/systems/scene_broadcaster/SceneBroadcaster.hh	100.00% <ø> (ø)
src/systems/thruster/Thruster.cc	92.30% <ø> (-0.06%)	⬇️
...ems/collada_world_exporter/ColladaWorldExporter.hh	100.00% <100.00%> (ø)
...ems/kinetic_energy_monitor/KineticEnergyMonitor.hh	100.00% <100.00%> (ø)
src/systems/user_commands/UserCommands.hh	100.00% <100.00%> (ø)
... and 1 more

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[chapulina]

Nice! They will all come back though unless we setup some CI for this.