Modernize project codebase (#906)

* 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

* Add safety checks and fix a issue with vector going OOR

Minecraft.World/InputStreamReader.cpp

@@ -39,7 +39,7 @@ int InputStreamReader::read(wchar_t cbuf[], unsigned int offset, unsigned int le
 	unsigned int charsRead = 0;
 	for( unsigned int i = offset; i < offset + length; i++ )
 	{
-		wchar_t value = (wchar_t)stream->readUTFChar();
+		wchar_t value = static_cast<wchar_t>(stream->readUTFChar());
 		if( value != -1 )
 		{
 			cbuf[i] = value;