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/DLCTexturePack.h

@@ -50,7 +50,7 @@ public:
 	bool isTerrainUpdateCompatible();
 
 	// 4J Added
-	virtual wstring getPath(bool bTitleUpdateTexture = false, const char *pchBDPatchFilename=NULL);
+	virtual wstring getPath(bool bTitleUpdateTexture = false, const char *pchBDPatchFilename=nullptr);
 	virtual wstring getAnimationString(const wstring &textureName, const wstring &path);
 	virtual BufferedImage *getImageResource(const wstring& File, bool filenameHasExtension = false, bool bTitleUpdateTexture=false, const wstring &drive =L"");
 	virtual void loadColourTable();