Custom fixed framerate and Isometric projection on bullets!

Summary

Finally I'm getting a good grasp on how to manage timing precisely on these bullets. No more stutters or inconsistencies!
On top of that I toyed around with the isometric projection. The entities and bullets behaviors are now taking that projection into account correctly.
I'm now confident enough about that key part of the game to move on to reimplementing the player character's part of the core gameplay.
How to structure correctly the code according to these mechanics is still quite a challenge for me. I will try to keep it simple though as the priority is on proving the potential of the concept.

Changelog

Add custom fixed framerate and time tracking
Implement isometric projection

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