Network IDs in entities should simply use the EntityIds class constants in PocketMine

[Sandertv]

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PocketMine-MP Version: 3.2.0
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Description

The Data constants were previously used for the entity IDs, but PocketMine has all of the entity network ID constants in the core already since some time. The current constants in PEX are redundant and could be removed. This also makes it easier to update should the IDs change.

[95CivicSi]

Let's hope they don't but yeah, this could be important. I'll probably fix this by updating the Data IDs to be linked to the PocketMine-MP internal IDs where possible.