Modernize project codebase (#906)

* 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

* Add safety checks and fix a issue with vector going OOR

Minecraft.World/CraftingContainer.cpp

@@ -58,7 +58,7 @@ bool CraftingContainer::hasCustomName()
 
 shared_ptr<ItemInstance> CraftingContainer::removeItemNoUpdate(int slot)
 {
-	if ((*items)[slot] != NULL)
+	if ((*items)[slot] != nullptr)
 	{
 		shared_ptr<ItemInstance> item = (*items)[slot];
 		(*items)[slot] = nullptr;
@@ -69,7 +69,7 @@ shared_ptr<ItemInstance> CraftingContainer::removeItemNoUpdate(int slot)
 
 shared_ptr<ItemInstance> CraftingContainer::removeItem(unsigned int slot, int count)
 {
-	if ((*items)[slot] != NULL)
+	if ((*items)[slot] != nullptr)
 	{
 		if ((*items)[slot]->count <= count)
 		{