Update Tesseract.js (#14708)

* [WiP] Update Tesseract.js

- Update Tesseract.js to 2.2.1
- Use versioned file names
- differentiate two progression states: preparing OCR and detecting picture

* Get rid of copy-webpack-plugin

config/webpack/rules/index.js

@@ -1,6 +1,7 @@
 const babel = require('./babel');
 const css = require('./css');
 const file = require('./file');
+const tesseract = require('./tesseract');
 const nodeModules = require('./node_modules');
 
 // Webpack loaders are processed in reverse order
@@ -8,6 +9,7 @@ const nodeModules = require('./node_modules');
 // Lastly, process static files using file loader
 module.exports = {
   file,
+  tesseract,
   css,
   nodeModules,
   babel,