Bash completion for flags

[mabelzhang]

🎉 New feature

Part of gazebosim/gz-tools#1
Used together with gazebosim/gz-tools#87

Summary

Bash completion, installation, tests.

Test it

$ . install/share/gz/gz1.completion
$ ign sdf -
--check           --describe        --force-version   --help            --inertial-stats  --print           --versions        -d                -h                -k                -p

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.

[chapulina]

LGTM! Pushed small fixes on 488d2ac:

• Use sdf::Filesystem to fix Bionic build
• Always install CLI files (see [tracker] Remove ignition-tools cmake check in Ignition software gazebo-tooling/release-tools#472)

[codecov]

Codecov Report

Merging #1042 (0beddd2) into sdf9 (a428e2a) will increase coverage by 44.11%.
The diff coverage is n/a.

❗ Current head 0beddd2 differs from pull request most recent head 488d2ac. Consider uploading reports for the commit 488d2ac to get more accurate results

@@             Coverage Diff             @@
##             sdf9    #1042       +/-   ##
===========================================
+ Coverage   43.47%   87.59%   +44.11%     
===========================================
  Files           1       64       +63     
  Lines          23    10061    +10038     
===========================================
+ Hits           10     8813     +8803     
- Misses         13     1248     +1235     

Impacted Files	Coverage Δ
test_config.h
src/Error.cc	100.00% <0.00%> (ø)
src/Console.cc	87.71% <0.00%> (ø)
src/Actor.cc	83.33% <0.00%> (ø)
src/Scene.cc	100.00% <0.00%> (ø)
src/Cylinder.cc	93.10% <0.00%> (ø)
include/sdf/Element.hh	100.00% <0.00%> (ø)
src/Camera.cc	81.16% <0.00%> (ø)
include/sdf/Filesystem.hh	100.00% <0.00%> (ø)
src/SDF.cc	92.26% <0.00%> (ø)
... and 55 more

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