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/DungeonFeature.cpp

@@ -142,12 +142,12 @@ void DungeonFeature::addTunnel(int xOffs, int zOffs, byteArray blocks, double xC
 						{
 							if (yy < 10)
 							{
-								blocks[p] = (byte) Tile::lava_Id;
+								blocks[p] = static_cast<byte>(Tile::lava_Id);
 							}
 							else
 							{
-								blocks[p] = (byte) 0;
-								if (hasGrass && blocks[p - 1] == Tile::dirt_Id) blocks[p - 1] = (byte) Tile::grass_Id;
+								blocks[p] = static_cast<byte>(0);
+								if (hasGrass && blocks[p - 1] == Tile::dirt_Id) blocks[p - 1] = static_cast<byte>(Tile::grass_Id);
 							}
 						}
 					}