Bunch of issues sorted together .

[Lysandr0]

• InstantBow apparently always triggers with the first crossbow shot (why is it even enabled at all?);
• Major: players can stand on top of tilted drip leaves (!)(to avoid latency-based false positive, we might use the block change tracker system here)
• Bubble streams adjacent to each other drag/push: push prevails even if the box is in the column by pixels. ISSUE: we don’t get told if the column can also push the player;
• vAcc velocity downwards (old TODO);
• vAcc with slowfall (don’t skip, adapt rather);
• False positives when closing a shulker (ISSUE: No PlayerMoveEvent fires here. Great);
• Low-jump false positive after jumping out of water and onto a water lily;
• Liquid modeling with slowfall is still quite rough;
• Levitation will need a refine later;
• Bubble columns ascend -> refine;
• Fix onGround judgement with slowfall

(reported by @CaptainObvious0)

• Attempting to jump in water with a jump potion active will flag;
• Jumping into a waterfall will flag for swimup, as well as taking vertical velocity while ascending in water;
• Although not common in survival/most servers, there can be some flags when moving directly after a teleport when the liftoff is reset to UNKNOWN (fixed, hopefully, not tested);
• Lowjump will still flag if bouncing on beds [Add workaround, actually implement this todo