chore(modeler): drop in-app file association behavior

Associating files is now provided by installer.

Related to #787

app/lib/platform/windows/index.js

@@ -1,19 +1,8 @@
 'use strict';
 
-var dialog = require('electron').dialog;
-
-var FileAssociations = require('./file-associations');
-
-var FILE_ASSOCIATION_KEY = 'fileAssociation';
 
 function WindowsPlatform(app, config) {
 
-  // setup file associations + deferred open file
-  // specified via command-line
-  app.on('app:client-ready', function() {
-    checkFileAssociations(app, config);
-  });
-
   /**
    * Adding recent open files.
    */
@@ -26,70 +15,4 @@ function WindowsPlatform(app, config) {
   });
 }
 
-module.exports = WindowsPlatform;
-
-
-/**
- * Check application file associations and
- * initialize/update as needed.
- *
- * @param {ElectronApp} app
- * @param {Config} config
- */
-function checkFileAssociations(app, config) {
-
-  var executablePath = app.getPath('exe');
-
-  var userChoice = config.get(FILE_ASSOCIATION_KEY);
-
-  needsAssociation(userChoice, function(err, associate) {
-
-    if (err) {
-      return console.error('[file association] failed to check', err);
-    }
-
-    if (associate) {
-
-      associateEditor(executablePath, function(err) {
-        if (err) {
-          return console.error('[file association] failed to associate', err);
-        }
-      });
-    }
-
-    config.set(FILE_ASSOCIATION_KEY, associate);
-  });
-}
-
-
-function needsAssociation(existingChoice, done) {
-
-  if (existingChoice !== undefined) {
-    return done(null, existingChoice);
-  } else {
-    suggestFileAssociation(done);
-  }
-}
-
-function associateEditor(executablePath, done) {
-
-  try {
-    FileAssociations.register(executablePath);
-  } catch (e) {
-    return done(e);
-  }
-
-  done(null);
-}
-
-function suggestFileAssociation(done) {
-  dialog.showMessageBox({
-    type: 'question',
-    buttons: [ 'Yes', 'No' ],
-    title: 'Camunda Modeler',
-    message: 'Do you want to associate your .bpmn, .dmn and .cmmn files to the Camunda Modeler?'
-  }, function(answer) {
-    // return true, if the user agreed
-    done(null, answer === 0);
-  });
-}
+module.exports = WindowsPlatform;