#1775 add indentation rules, fix inconsistent files

[mvolikas]

Fixes #1775

Notes:
Most differences are whitespace.

We might also want to adjust the readme so that we include the commands to check via checkstyle and edditorconfig:

# check with checkstyle and generate reports under /target
mvn checkstyle:check

# check with edditorconfig
mvn validate

# format via edditorconfig plugin
mvn editorconfig:format

[rzo1]

Lgtm.

• How does checkstyle format interact with the formatting plugin in place?
• Would it make sense to add an action similar to license for fixing intendition if missed or broken?