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/BeachBiome.cpp

@@ -8,8 +8,8 @@ BeachBiome::BeachBiome(int id) : Biome(id)
 	// remove default mob spawn settings
 	friendlies.clear();
 	friendlies_chicken.clear();	// 4J added
-	topMaterial = (byte) Tile::sand_Id;
-	material = (byte) Tile::sand_Id;
+	topMaterial = static_cast<byte>(Tile::sand_Id);
+	material = static_cast<byte>(Tile::sand_Id);
 
 	decorator->treeCount = -999;
 	decorator->deadBushCount = 0;