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/ResourceLocation.h

@@ -34,7 +34,7 @@ public:
 		m_texture = textureNameArray(textures.length);
 		for(unsigned int i = 0; i < textures.length; ++i)
 		{
-			m_texture[i] = (_TEXTURE_NAME)textures[i];
+			m_texture[i] = static_cast<_TEXTURE_NAME>(textures[i]);
 		}
 		m_preloaded = true;
 	}