Modified gitignore to avoid tracking .DS_Store MacOS files and also r…

[utkarshanand140]

Fixes a part of #871
Replaced unnecessary strings with characters to make compilation faster.
Also modified the .gitignore file to avoid tracking .DS_Store files which are often generated when working on MacOS systems.

[sjahr]

Thanks for these changes. Can you try to fix it everywhere rather than partially? There was an abandoned PR that attempted the same you could pick up and bring over the finish line

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 0.00%. Comparing base (d962501) to head (b06593c).
Report is 33 commits behind head on main.

Files	Patch %	Lines
...t_core/collision_detection/src/collision_tools.cpp	0.00%	1 Missing ⚠️
...oveit_setup_srdf_plugins/src/group_meta_config.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #2705       +/-   ##
==========================================
- Coverage   50.74%   0.00%   -50.73%     
==========================================
  Files         392     672      +280     
  Lines       32553   56718    +24165     
  Branches        0    7247     +7247     
==========================================
- Hits        16517       0    -16517     
- Misses      16036   56718    +40682     

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[utkarshanand140]

Thanks for these changes. Can you try to fix it everywhere rather than partially? There was an abandoned PR that attempted the same you could pick up and bring over the finish line

Yes sure, I'll be happy to complete it.

[github-actions]

This PR is stale because it has been open for 45 days with no activity. Please tag a maintainer for help on completing this PR, or close it if you think it has become obsolete.

[EzraBrooks]

Please break these changes out into two PRs - I'd be happy to approve and merge the .gitignore change separately from the code changes.

[github-actions]

This PR is stale because it has been open for 45 days with no activity. Please tag a maintainer for help on completing this PR, or close it if you think it has become obsolete.