Add automatic code-format to Analysis

[Richargh]

Add a tool for the Analysis Code that auto-formats code.

[alexhunziker]

We have looked at the following options:

• ktlint https://ktlint.github.io/ Is a linter for kotlin. It can be added to the build.gradle as a task. It supports to check the project for conformity with the code style as well as automatic re-formating (by using gradlew ktlint and gradlew ktlintFormat respectively). There are not a lot of configuration possibilities, however theoretically new rulesets could be added https://github.com/pinterest/ktlint#creating-a-ruleset. A major downside is that there is not really an option to disable certain rules for the project, instead directives would need to be included in the code.

• .editorconfig An .editorconfig file could be added to the project. IntelliJ recognizes such a file and applies the specified settings on "Reformate code". The range of supported properties by .editorconfig is relatively small and can be found here: https://editorconfig.org/ https://github.com/ec4j/editorconfig-gradle-plugin is a gradle plugin which allows to check the project for conformity with the rules defined in .editorconfig

• IntelliJ Code Style XML IntelliJ supports the export of the Code Style Settings as .xml file. This file must then be imported to intelliJ by all developers (that is a downside). However in contrast to the .editorconfig-file, here a wide range of properties can be stored.

• Use preconfigured IntelliJ Code Style for Kotlin IntelliJ supports two Code Style Settings by default. Enforcing the developer to use one can only be done by telling him/her to do so.

[alexhunziker]

https://github.com/JetBrains/inspection-plugin this one seems to be similar to ktlint

[Richargh]

Decisions: we'll use IntelliJ Code Style XML=IntelliJ supports the export of the Code Style Settings as .xml file.