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/InputStream.cpp

@@ -7,5 +7,5 @@ InputStream *InputStream::getResourceAsStream(const wstring &fileName)
 {
 	File file( fileName );
 
-	return file.exists() ? new FileInputStream( file ) : NULL;
+	return file.exists() ? new FileInputStream( file ) : nullptr;
 }