Version update

Here is the end of month update! As planned, this one brings a lot of optimizations. It should enable you to play on much lower configurations now. I am able to play on my 3 1/2 years old laptop, for instance, which has the minimum required config listed on the store page. So, this is an objective reached for the project :) There could be a few side effects to this large phase of optims, in the form of secondary bugs. We corrected most of them, but some could be left.