Standardize & apply standard formatting

[askarbozcan]

In a lot of places in the code, there's a weird mix of tabs & spaces, causing function bodies not to be indented correctly.

For an example, see LazySessionHandler.java

It seems that tab size is assumed to be 8 spaces, but then again in a lot places 4 spaces are used for indentation.

I propose adding a convention for the project's code, and perhaps a code formatter (perhaps as a Maven plugin?)

[jfaltermeier]

Makes sense. Currently the Java projects should have some project-specific files checked in for the Eclipse IDE. We should make this IDE independent.
Probably we should also add some checks to the verification build.

[github-actions]

This issue is stale because it has been open for 180 days with no activity.

[jfaltermeier]

Keep open