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/TickNextTickData.cpp

@@ -21,7 +21,7 @@ bool TickNextTickData::equals(const TickNextTickData *o) const
 {
 	// TODO 4J Is this safe to cast it before we do a dynamic_cast? Will the dynamic_cast still fail?
 	// We cannot dynamic_cast a void*
-	if ( o != NULL)
+	if ( o != nullptr)
 	{
 		TickNextTickData *t = (TickNextTickData *) o;
 		return x == t->x && y == t->y && z == t->z && Tile::isMatching(tileId, t->tileId);