Project modernization (#630)

* Fixed boats falling and a TP glitch #266

* Replaced every C-style cast with C++ ones

* Replaced every C-style cast with C++ ones

* Fixed boats falling and a TP glitch #266

* Updated NULL to nullptr and fixing some type issues

* Modernized and fixed a few bugs

- Replaced most instances of `NULL` with `nullptr`.
- Replaced most `shared_ptr(new ...)` with `make_shared`.
- Removed the `nullptr` macro as it was interfering with the actual nullptr keyword in some instances.

* Fixing more conflicts

* Replace int loops with size_t and start work on overrides

Minecraft.World/EnchantmentInstance.cpp

@@ -13,5 +13,5 @@ EnchantmentInstance::EnchantmentInstance(int id, int level) : WeighedRandomItem(
 // 4J Added
 EnchantmentInstance *EnchantmentInstance::copy()
 {
-	return new EnchantmentInstance((Enchantment *)enchantment, (int)level);
+	return new EnchantmentInstance((Enchantment *)enchantment, static_cast<int>(level));
 }