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/BeaconTile.cpp

@@ -11,7 +11,7 @@ BeaconTile::BeaconTile(int id) : BaseEntityTile(id, Material::glass, isSolidRend
 
 shared_ptr<TileEntity> BeaconTile::newTileEntity(Level *level)
 {
-	return shared_ptr<BeaconTileEntity>( new BeaconTileEntity() );
+	return std::make_shared<BeaconTileEntity>();
 }
 
 bool BeaconTile::use(Level *level, int x, int y, int z, shared_ptr<Player> player, int clickedFace, float clickX, float clickY, float clickZ, bool soundOnly)
@@ -19,7 +19,7 @@ bool BeaconTile::use(Level *level, int x, int y, int z, shared_ptr<Player> playe
 	if (level->isClientSide) return true;
 
 	shared_ptr<BeaconTileEntity> beacon = dynamic_pointer_cast<BeaconTileEntity>( level->getTileEntity(x, y, z) );
-	if (beacon != NULL) player->openBeacon(beacon);
+	if (beacon != nullptr) player->openBeacon(beacon);
 
 	return true;
 }