Add legacy support to use current methods for packets on 1.8

[JarvisCraft]

It seems that after some commits (due to update from legacy protocol of 47) some packets such as RelativeEntityMoveLook seem to be unavailable through PacketWrapper as the NMS-objects' signatures differ from those being now.
At current I am working on a PR to fix this issues whose idea is to check version (in optimized way) when using getters/setters and so allow current wrapper clases with their current signatures be used for older versions too.
This Issue's target is to ask whether this will (if done) be merged into PacketWrapper's master?

[JarvisCraft]

To be fair, I am not a big fan of legacy support but it unfortunately happens that 1.8 is still very popular among server-owners.

[JarvisCraft]

At current it looks like this (WrapperPlayServerEntityTeleport)

public double getX() {
	return MINOR_VERSION > 8 ? handle.getDoubles().read(0) : handle.getIntegers().read(1) / 32.0D;
}

public void setX(double value) {
	if (MINOR_VERSION > 8) handle.getDoubles().write(0, value);
	else handle.getIntegers().write(1, (int) Math.floor(value * 32.0D));
}

[JarvisCraft]

Migrated to #60.