v2.4.0

• Massive performance improvements (10-40%!)
• CPU and memory timings have been corrected* (passes Blargg's tests!)
• If you're making a plugin, then note that post_tick is now only called once at the end of pyboy.tick. Not for every frame.
• Clarify in docs that reads from pyboy.memory might return a memoryview in the future.
• If you're running pytest locally, TEST_CI has been removed and you now have to specifically set TEST_VERBOSE_IMAGES=1 to see debug images.

*If you depend on exact timing of a frame (assume a specific start block in Tetris etc.) then expect these to have changed. This change improves emulation correctness, and I cannot promise specific frame timings between releases.