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/JavaMath.cpp

@@ -36,7 +36,7 @@ double Math::random()
 //the value of the argument rounded to the nearest long value.
 int64_t Math::round( double d )
 {
-	return (int64_t)floor( d + 0.5 );
+	return static_cast<int64_t>(floor(d + 0.5));
 }
 
 int Math::_max(int a, int b)