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/LargeHellCaveFeature.cpp

@@ -138,7 +138,7 @@ void LargeHellCaveFeature::addTunnel(int64_t seed, int xOffs, int zOffs, byteArr
 						int block = blocks[p];
 						if (block == Tile::netherRack_Id || block == Tile::dirt_Id || block == Tile::grass_Id)
 						{
-							blocks[p] = (byte) 0;
+							blocks[p] = static_cast<byte>(0);
 						}
 					}
 					p--;