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/ByteArrayOutputStream.cpp

@@ -20,7 +20,7 @@ ByteArrayOutputStream::ByteArrayOutputStream(unsigned int size)
 
 ByteArrayOutputStream::~ByteArrayOutputStream()
 {
-	if (buf.data != NULL)
+	if (buf.data != nullptr)
 		delete[] buf.data;
 }
 
@@ -33,7 +33,7 @@ void ByteArrayOutputStream::write(unsigned int b)
 	if( count + 1 >=  buf.length )
 		buf.resize( buf.length * 2 );
 
-	buf[count] = (byte) b;
+	buf[count] = static_cast<byte>(b);
 	count++;
 }