Move languages into their own module

[Luni-4]

Follow up of #156

[calixteman]

could you rebase it please ?

[Luni-4]

could you rebase it please ?

Done!

[codecov-io]

Codecov Report

Merging #158 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #158   +/-   ##
=======================================
  Coverage   16.26%   16.26%           
=======================================
  Files          43       43           
  Lines        5409     5409           
  Branches      597      597           
=======================================
  Hits          880      880           
  Misses       4234     4234           
  Partials      295      295           

Impacted Files	Coverage Δ
src/preproc.rs	0.00% <ø> (ø)
src/rca_languages/language_ccomment.rs	0.00% <ø> (ø)
src/rca_languages/language_cpp.rs	0.00% <ø> (ø)
src/rca_languages/language_csharp.rs	0.00% <ø> (ø)
src/rca_languages/language_css.rs	0.00% <ø> (ø)
src/rca_languages/language_go.rs	0.00% <ø> (ø)
src/rca_languages/language_html.rs	0.00% <ø> (ø)
src/rca_languages/language_java.rs	0.00% <ø> (ø)
src/rca_languages/language_javascript.rs	0.00% <ø> (ø)
src/rca_languages/language_mozjs.rs	0.00% <ø> (ø)
... and 5 more

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