Implemented smithing table functionality

[HimmelKreis4865]

Introduction

This PR adds working smithing tables to pocketmine. There are no known issues or problems

Changes

API changes

Amor->setTrim(ArmorTrim) Armor->getTrim() : ?ArmorTrim Armor->clearTrim()

SmithingTableInventory->getInput() : Item SmithingTableInventory->getAddition() : Item SmithingTableInventory->getTemplate() : Item

The new enums: ArmorTrimPattern & ArmorTrimMaterial (required to construct ArmorTrim)

Tests

Tested ingame with the smithing table several times:

Tested the code

$player->getInventory()->addItem(VanillaItems::LEATHER_CAP()->setTrim(new ArmorTrim(ArmorTrimMaterial::QUARTZ, ArmorTrimPattern::EYE)));

[HimmelKreis4865]

There's not much more I can do at this point, everthing is fixed except for save ids.

[fractalllll]

how do I put this on my server?

[pandaa-be]

Looks finished now :)

[HimmelKreis4865]

yeah, ready to be reviewed again.