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/Polygon.cpp

@@ -58,17 +58,17 @@ void _Polygon::render(Tesselator *t, float scale)
     t->begin();
     if (_flipNormal)
 	{
-        t->normal(-(float)n->x, -(float)n->y, -(float)n->z);
+        t->normal(-static_cast<float>(n->x), -static_cast<float>(n->y), -static_cast<float>(n->z));
     }
 	else
 	{
-        t->normal((float)n->x, (float)n->y, (float)n->z);
+        t->normal(static_cast<float>(n->x), static_cast<float>(n->y), static_cast<float>(n->z));
     }
 
     for (int i = 0; i < 4; i++)
 	{
         Vertex *v = vertices[i];
-        t->vertexUV((float)(v->pos->x * scale), (float)( v->pos->y * scale), (float)( v->pos->z * scale), (float)( v->u), (float)( v->v));
+        t->vertexUV(static_cast<float>(v->pos->x * scale), static_cast<float>(v->pos->y * scale), static_cast<float>(v->pos->z * scale), (float)( v->u), (float)( v->v));
     }
     t->end();
 }