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/LargeCaveFeature.cpp

@@ -144,11 +144,11 @@ void LargeCaveFeature::addTunnel(int64_t seed, int xOffs, int zOffs, byteArray b
 							{
 								if (yy < 10)
 								{
-									blocks[p] = (byte) Tile::lava_Id;
+									blocks[p] = static_cast<byte>(Tile::lava_Id);
 								}
 								else
 								{
-									blocks[p] = (byte) 0;
+									blocks[p] = static_cast<byte>(0);
 									if (hasGrass && blocks[p - 1] == Tile::dirt_Id) blocks[p - 1] = (byte) level->getBiome(xx + xOffs * 16, zz + zOffs * 16)->topMaterial;
 								}
 							}