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.Client/Common/GameRules/AddEnchantmentRuleDefinition.cpp

@@ -46,7 +46,7 @@ void AddEnchantmentRuleDefinition::addAttribute(const wstring &attributeName, co
 bool AddEnchantmentRuleDefinition::enchantItem(shared_ptr<ItemInstance> item)
 {
 	bool enchanted = false;
-	if (item != NULL)
+	if (item != nullptr)
 	{
 		// 4J-JEV: Ripped code from enchantmenthelpers
 		// Maybe we want to add an addEnchantment method to EnchantmentHelpers
@@ -58,7 +58,7 @@ bool AddEnchantmentRuleDefinition::enchantItem(shared_ptr<ItemInstance> item)
 		{
 			Enchantment *e = Enchantment::enchantments[m_enchantmentId];
 
-			if(e != NULL && e->category->canEnchant(item->getItem()))
+			if(e != nullptr && e->category->canEnchant(item->getItem()))
 			{
 				int level = min(e->getMaxLevel(), m_enchantmentLevel);
 				item->enchant(e, m_enchantmentLevel);