skeleton of the command to load scripts

[gogo2464]

This PR does not do nothing interesting for the moment. It is just to show. Next I will implement the run: see.

I should have done:

core.add_command("executeScript", "es", Arc::new(Mutex::new(ExecuteScript:new()))); instead. I will fix it as soon as possible.

[gogo2464]

I need to update the unit test to add my new command.

[codecov[bot]]

Codecov Report

Merging #92 into master will decrease coverage by 0.76%. The diff coverage is 31.25%.

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
- Coverage   95.31%   94.55%   -0.77%     
==========================================
  Files          47       48       +1     
  Lines        3010     3012       +2     
==========================================
- Hits         2869     2848      -21     
- Misses        141      164      +23     

Impacted Files	Coverage Δ
src/utils/cmd.rs	15.38% <15.38%> (ø)
src/core.rs	96.34% <100.00%> (-1.19%)	:arrow_down:
src/utils/mod.rs	100.00% <100.00%> (ø)
rtrees/src/ist/rb_helpers.rs	88.88% <0.00%> (-11.12%)	:arrow_down:
rtrees/src/rbtree/iter.rs	95.65% <0.00%> (-4.35%)	:arrow_down:
rtrees/src/rbtree/iter_ref.rs	92.00% <0.00%> (-4.00%)	:arrow_down:
rair-io/src/plugins/defaultplugin.rs	96.36% <0.00%> (-1.82%)	:arrow_down:
rair-io/src/mapsquery.rs	95.83% <0.00%> (-1.05%)	:arrow_down:
rair-io/src/descquery.rs	97.24% <0.00%> (-0.92%)	:arrow_down:
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 77a3eca...18b3a69. Read the comment docs.

[gogo2464]

I added new unit test to make coverage be better.