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/OffsettedRenderList.cpp

@@ -20,9 +20,9 @@ void OffsettedRenderList::init(int x, int y, int z, double xOff, double yOff, do
     this->y = y;
     this->z = z;
 
-    this->xOff = (float) xOff;
-    this->yOff = (float) yOff;
-    this->zOff = (float) zOff;
+    this->xOff = static_cast<float>(xOff);
+    this->yOff = static_cast<float>(yOff);
+    this->zOff = static_cast<float>(zOff);
 }
 
 bool OffsettedRenderList::isAt(int x, int y, int z)