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/PressurePlateTile.cpp

@@ -23,14 +23,14 @@ int PressurePlateTile::getSignalForData(int data)
 
 int PressurePlateTile::getSignalStrength(Level *level, int x, int y, int z)
 {
-	vector< shared_ptr<Entity> > *entities = NULL;
+	vector< shared_ptr<Entity> > *entities = nullptr;
 
 	if (sensitivity == everything)		entities = level->getEntities(nullptr, getSensitiveAABB(x, y, z));
 	else if (sensitivity == mobs)		entities = level->getEntitiesOfClass(typeid(LivingEntity), getSensitiveAABB(x, y, z));
 	else if (sensitivity == players)	entities = level->getEntitiesOfClass(typeid(Player), getSensitiveAABB(x, y, z));
 	else								__debugbreak(); // 4J-JEV: We're going to delete something at a random location.
 
-	if (entities != NULL && !entities->empty())
+	if (entities != nullptr && !entities->empty())
 	{
         for (auto& e : *entities)
         {