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/HtmlString.cpp

@@ -38,7 +38,7 @@ wstring HtmlString::ToString()
 
 wstring HtmlString::Compose(vector<HtmlString> *strings)
 {
-	if (strings == NULL) return L"";
+	if (strings == nullptr) return L"";
 
 	std::wstringstream ss;