Parse correctly OGRE2_RESOURCE_PATH on Windows

[traversaro]

🦟 Bug fix

Fixes wrong handling of OGRE2_RESOURCE_PATH on Windows.

Summary

It was assume that the OGRE2_RESOURCE_PATH was a :-delimiter list of paths. However, on Windows : is the separator between the drive letter and the path, so ; should be used instead.

Everything was working fine as C:\this\is\a\path and \this\is\a\path are both valid paths if the active drive is C:\, but as soon as the current active directory was for example on D:, OGRE2_RESOURCE_PATH was not read correctly, see https://github.com/conda-forge/gz-sim-feedstock/issues/57 .

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [ ] 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.

[iche033]

looks good to me. Can you fix DCO?

[traversaro]

looks good to me. Can you fix DCO?

Done!

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.68%. Comparing base (f95826f) to head (07c28d3).

Files	Patch %	Lines
ogre2/src/Ogre2RenderEngine.cc	50.00%	1 Missing :warning:

Additional details and impacted files

@@              Coverage Diff               @@
##           gz-rendering7     #996   +/-   ##
==============================================
  Coverage          77.68%   77.68%           
==============================================
  Files                170      170           
  Lines              14733    14733           
==============================================
  Hits               11445    11445           
  Misses              3288     3288           

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