Automate building of TypeScript definitions

[sveyret]

Because I almost forgot to update index.d.ts last time I added a special parser, I modified the component.js script in order to make it possible to rebuild this index.d.ts file.

[codecov]

Codecov Report

Merging #470 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #470   +/-   ##
=======================================
  Coverage   99.21%   99.21%           
=======================================
  Files          39       39           
  Lines         761      761           
=======================================
  Hits          755      755           
  Misses          6        6

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[rumpl]

This is not normal is it?

[sveyret]

It is. Instead of directly writing the list of parsers, detectors and specials, the index is now a template, and the component.js script is completing it with all the files found in appropriate directories, just the same way it is creating the component.json file.
If you are specifically talking about the empty line, each group (parser, detector and special) is written starting with an empty line. If you run npm run component, you will see that the generated dist/index.d.ts is the same as the previous index.d.ts (at least, it should be!)