Rename CMake project to gz

[chapulina]

• See CMake project names from ignition to gz gazebo-tooling/release-tools#718

Shared libs

To test the warnings for ignition- prefixed physics engines, try:

$ ign gazebo rolling_shapes.sdf -v 2 --physics-engine ignition-physics-dartsim-plugin           
...                                              
[Wrn] [Physics.cc:760] Trying to load deprecated plugin [ignition-physics-dartsim-plugin]. Use [gz-physics-dartsim-plugin] instead.
...

And for the render engine:

$ ign gazebo shapes.sdf -v 2 --render-engine ignition-rendering-ogre
[Wrn] [ServerConfig.cc:543] Trying to load deprecated engine [ignition-rendering-ogre] for the server. Use [gz-rendering-ogre] instead.
[Wrn] [ServerConfig.cc:574] Trying to load deprecated engine [ignition-rendering-ogre] for the GUI. Use [gz-rendering-ogre] instead.
...
[GUI] [Wrn] [MainWindow.cc:955] Trying to load deprecated plugin [ignition-rendering-ogre]. Use [gz-rendering-ogre] instead.
...

I added a world that tries to load ignition-gazebo prefixed plugins to demonstrate that they still work:

$ ign gazebo deprecated_ignition.sdf  -v 2
...
[Wrn] [SystemLoader.cc:54] Trying to load deprecated plugin [ignition-gazebo-physics-system]. Using [gz-sim-physics-system] instead.
[Wrn] [SystemLoader.cc:54] Trying to load deprecated plugin [ignition-gazebo-user-commands-system]. Using [gz-sim-user-commands-system] instead.
[Wrn] [SystemLoader.cc:54] Trying to load deprecated plugin [ignition-gazebo-scene-broadcaster-system]. Using [gz-sim-scene-broadcaster-system] instead.
...

CMake targets

Since the CMake targets are changing, I took the opportunity to update various parts of the code to use targets instead of other variables. This unveiled places where we were over-linking to things we didn't need, or relying on transient dependencies. That's why this PR has added arguments to target_link_libraries in various places.

[codecov]

Codecov Report

Merging #1527 (cdad509) into main (a3cbd8c) will decrease coverage by 0.01%.
The diff coverage is 99.31%.

@@            Coverage Diff             @@
##             main    #1527      +/-   ##
==========================================
- Coverage   63.62%   63.61%   -0.02%     
==========================================
  Files         330      330              
  Lines       25787    25881      +94     
==========================================
+ Hits        16408    16465      +57     
- Misses       9379     9416      +37     

Impacted Files	Coverage Δ
include/gz/sim/EventManager.hh	79.16% <ø> (ø)
include/gz/sim/Util.hh	100.00% <ø> (ø)
include/gz/sim/detail/View.hh	100.00% <ø> (ø)
include/gz/sim/gui/GuiEvents.hh	0.00% <ø> (ø)
include/gz/sim/components/Factory.hh	97.53% <80.00%> (-1.18%)	⬇️
include/gz/sim/EntityComponentManager.hh	100.00% <100.00%> (ø)
include/gz/sim/Link.hh	100.00% <100.00%> (ø)
include/gz/sim/Model.hh	100.00% <100.00%> (ø)
include/gz/sim/SdfEntityCreator.hh	100.00% <100.00%> (ø)
include/gz/sim/Server.hh	100.00% <100.00%> (ø)
... and 129 more

---

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[chapulina]

No new test failures! 🚀