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/RecordingItem.cpp

@@ -30,7 +30,7 @@ bool RecordingItem::useOn(shared_ptr<ItemInstance> itemInstance, shared_ptr<Play
 		{
 			if (level->isClientSide) return true;
 
-			((JukeboxTile *) Tile::jukebox)->setRecord(level, x, y, z, itemInstance);
+			static_cast<JukeboxTile *>(Tile::jukebox)->setRecord(level, x, y, z, itemInstance);
 			level->levelEvent(nullptr, LevelEvent::SOUND_PLAY_RECORDING, x, y, z, id);
 			itemInstance->count--;
 
@@ -73,6 +73,6 @@ RecordingItem *RecordingItem::getByName(const wstring &name)
 	}
 	else
 	{
-		return NULL;
+		return nullptr;
 	}
 }