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/ServersideAttributeMap.cpp

@@ -17,7 +17,7 @@ AttributeInstance *ServersideAttributeMap::getInstance(eATTRIBUTE_ID id)
 
 	// 4J: Removed legacy name
 	// If we didn't find it, search by legacy name
-	/*if (result == NULL)
+	/*if (result == nullptr)
 	{
 		auto it = attributesByLegacy.find(name);
 		if(it != attributesByLegacy.end())
@@ -43,7 +43,7 @@ AttributeInstance *ServersideAttributeMap::registerAttribute(Attribute *attribut
 	// 4J: Removed legacy name
 	// If this is a ranged attribute also add to legacy name map
 	/*RangedAttribute *rangedAttribute = dynamic_cast<RangedAttribute*>(attribute);
-	if (rangedAttribute != NULL && rangedAttribute->getImportLegacyName() != L"")
+	if (rangedAttribute != nullptr && rangedAttribute->getImportLegacyName() != L"")
 	{
 		attributesByLegacy.insert(std::pair<wstring, AttributeInstance*>(rangedAttribute->getImportLegacyName(), instance));
 	}*/
@@ -69,7 +69,7 @@ unordered_set<AttributeInstance *> *ServersideAttributeMap::getSyncableAttribute
 	unordered_set<AttributeInstance *> *result = new unordered_set<AttributeInstance *>();
 	vector<AttributeInstance *> atts;
 	getAttributes(atts);
-	for (int i = 0; i < atts.size(); i++)
+	for (size_t i = 0; i < atts.size(); i++)
 	{
 		AttributeInstance *instance = atts.at(i);