chore(gradle): remove IDE setup tasks (#513)

- remove "gradlew idea" task
- remove "gradlew eclipse" task
- remove project file generation step from README.md

README.md

@@ -148,10 +148,6 @@ You'll need the following tools:
 - Git to clone the repo and commit changes.
 
 Development is possible on all common platforms (Windows, Linux, MacOS) as long as the JDK with JavaFX is properly set up.
-
-To generate the project files for IntelliJ, open a command prompt in the directory you checked out into and execute `gradlew idea` - this fetches the right version of Gradle and all project dependencies automatically, as well as generates the project config. Afterwards, you can simply open the project file in IntelliJ.
-
-There is also a version for Eclipse - `gradlew eclipse` - but we encourage you to use IntelliJ.
 
 </details>
 
@@ -188,10 +184,6 @@ Apart from Git, basically everything can be done using the [Gradle][gradle] [wra
       <td width="50%"><code>gradlew tasks</code></td>
       <td width="50%"><i>Display other available build script tasks.</i></td>
   </tr>
-  <tr>
-      <td width="50%"><code>gradlew idea`</td>
-      <td width="50%"><i>Generate IntelliJ IDEA project files.</i></td>
-  </tr>
 </table>
 
 Assume you have pushed some changes to your fork into a branch `myFeature`. In order to let us know about your work and give us the possibility to incorporate your changes you should send us a _pull request_. You can do this by selecting the `myFeature` branch on your GitHub repo and click the button which says "Open pull request".

build.gradle

@@ -38,8 +38,6 @@ plugins {
     id 'checkstyle'
     id 'com.github.spotbugs' version '1.6.9'
     id 'de.undercouch.download' version '3.4.3' // TODO: upgrade to latest version (191011: 4.0.0)
-    id 'eclipse'
-    id 'idea'
     id 'java'
     id 'nebula.release' version '14.1.0'
     id 'org.hidetake.swagger.generator' version '2.18.1'
@@ -52,7 +50,6 @@ apply from: "./config/gradle/jre.gradle"
 //apply from: "./config/gradle/bundles.gradle"
 apply from: "./config/gradle/quality.gradle"
 apply from: "./config/gradle/swagger.gradle"
-apply from: "./config/gradle/environment.gradle"
 
 // Test for right version of Java in use for running this script
 assert org.gradle.api.JavaVersion.current().isJava8Compatible()