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/LightningBoltRenderer.cpp

@@ -79,8 +79,8 @@ void LightningBoltRenderer::render(shared_ptr<Entity> _bolt, double x, double y,
                     if (i == 1 || i == 2) xx2 += rr2 * 2;
                     if (i == 2 || i == 3) zz2 += rr2 * 2;
 
-                    t->vertex((float)(xx2 + xo0), (float)( y + (h) * 16), (float)( zz2 + zo0));
-                    t->vertex((float)(xx1 + xo1), (float)( y + (h + 1) * 16), (float)( zz1 + zo1));
+                    t->vertex(static_cast<float>(xx2 + xo0), static_cast<float>(y + (h) * 16), static_cast<float>(zz2 + zo0));
+                    t->vertex(static_cast<float>(xx1 + xo1), static_cast<float>(y + (h + 1) * 16), static_cast<float>(zz1 + zo1));
 
                 }