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/EndermanRenderer.cpp

@@ -10,7 +10,7 @@ ResourceLocation EndermanRenderer::ENDERMAN_LOCATION = ResourceLocation(TN_MOB_E
 
 EndermanRenderer::EndermanRenderer() : MobRenderer(new EndermanModel(), 0.5f)
 {
-	model = (EndermanModel *) MobRenderer::model;
+	model = static_cast<EndermanModel *>(MobRenderer::model);
 	this->setArmor(model);
 }