added in-flight frames, window resizing and minimization

- made every swapchain image have it's own render finished semaphore
- renamed draw fence to in-flight fence (fence_draw to fences_in_flight)
- made present complete semaphores and in-flight fences "per in-flight
  frames", meaning that if we have at most 2 in-flight frames, we use 2
  present complete semaphores and 2 in-flight fences
- recreate swapchain when needed
- more refactoring
- added fps counter

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