Restructuring the kdevelop.git folder layout

[René J. V. Bertin]

Kevin Funk wrote:

>> Reasoning:
>> - Make it easier to understand the kdevelop.git layout for newcomers.
>> - Make the layout more consistent.
> 
> Pushed to 5.2 branch:
>> Opinions?

More of a question: is there more restructuring to come in the near future?

Thanks,
R.