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/ButtonTile.cpp

@@ -21,7 +21,7 @@ Icon *ButtonTile::getTexture(int face, int data)
 
 AABB *ButtonTile::getAABB(Level *level, int x, int y, int z)
 {
-	return NULL;
+	return nullptr;
 }
 
 int ButtonTile::getTickDelay(Level *level)
@@ -302,7 +302,7 @@ void ButtonTile::checkPressed(Level *level, int x, int y, int z)
 	bool shouldBePressed;
 
 	updateShape(data);
-	Tile::ThreadStorage *tls = (Tile::ThreadStorage *)TlsGetValue(Tile::tlsIdxShape);
+	Tile::ThreadStorage *tls = static_cast<Tile::ThreadStorage *>(TlsGetValue(Tile::tlsIdxShape));
 	vector<shared_ptr<Entity> > *entities = level->getEntitiesOfClass(typeid(Arrow), AABB::newTemp(x + tls->xx0, y + tls->yy0, z + tls->zz0, x + tls->xx1, y + tls->yy1, z + tls->zz1));
 	shouldBePressed = !entities->empty();
 	delete entities;