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.Client/Common/DLC/DLCTextureFile.cpp

@@ -7,7 +7,7 @@ DLCTextureFile::DLCTextureFile(const wstring &path) : DLCFile(DLCManager::e_DLCT
 	m_bIsAnim = false;
 	m_animString = L"";
 	
-	m_pbData = NULL;
+	m_pbData = nullptr;
 	m_dwBytes = 0;
 }