Reduce developer set-up time with an IntelliJ shared index

[keturn]

When opening a project for the first time IntelliJ spends a while indexing. This can take a few minutes, maybe longer, depending on how fast your development workstation is.

But there's no reason for every installation to re-build those indices from scratch. We could build them once and share the result: https://www.jetbrains.com/help/idea/shared-indexes.html#project-shared-indexes

Maybe this could be done as a CI step?

Questions:

• Will it share indices for all of Terasology's dependencies, or does it only include the code that's in the project itself?
• How often do they need to be rebuilt? If the index server is a few commits behind your current workspace, does it still save time?

[pollend]

we could publish it to the artifactory I think.