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.Client/Font.h

@@ -38,7 +38,7 @@ private:
 	std::map<int, int> m_charMap;
 
 public:
-    Font(Options *options, const wstring& name, Textures* textures, bool enforceUnicode, ResourceLocation *textureLocation, int cols, int rows, int charWidth, int charHeight, unsigned short charMap[] = NULL);
+    Font(Options *options, const wstring& name, Textures* textures, bool enforceUnicode, ResourceLocation *textureLocation, int cols, int rows, int charWidth, int charHeight, unsigned short charMap[] = nullptr);
 #ifndef _XBOX
 	// 4J Stu - This dtor clashes with one in xui! We never delete these anyway so take it out for now. Can go back when we have got rid of XUI
 	~Font();