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/Common/DLC/DLCFile.h

@@ -12,12 +12,12 @@ public:
 	DLCFile(DLCManager::EDLCType type, const wstring &path);
 	virtual ~DLCFile() {}
 
-	DLCManager::EDLCType getType()	{ return m_type; }
+	DLCManager::EDLCType getType() const { return m_type; }
 	wstring getPath()				{ return m_path; }
-	DWORD getSkinID()				{ return m_dwSkinId; }
+	DWORD getSkinID() const { return m_dwSkinId; }
 
 	virtual void addData(PBYTE pbData, DWORD dwBytes) {}
-	virtual PBYTE getData(DWORD &dwBytes) { dwBytes = 0; return NULL; }
+	virtual PBYTE getData(DWORD &dwBytes) { dwBytes = 0; return nullptr; }
 	virtual void addParameter(DLCManager::EDLCParameterType type, const wstring &value) {}
 
 	virtual wstring getParameterAsString(DLCManager::EDLCParameterType type) { return L""; }