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/BreakDoorGoal.cpp

@@ -47,7 +47,7 @@ void BreakDoorGoal::tick()
 
 	breakTime++;
 
-	int progress = (int) (breakTime / (float) DOOR_BREAK_TIME * 10);
+	int progress = static_cast<int>(breakTime / (float)DOOR_BREAK_TIME * 10);
 	if (progress != lastBreakProgress)
 	{
 		mob->level->destroyTileProgress(mob->entityId, doorX, doorY, doorZ, progress);