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.World/RunAroundLikeCrazyGoal.cpp

@@ -17,9 +17,9 @@ RunAroundLikeCrazyGoal::RunAroundLikeCrazyGoal(EntityHorse *mob, double speedMod
 
 bool RunAroundLikeCrazyGoal::canUse()
 {
-	if (horse->isTamed() || horse->rider.lock() == NULL) return false;
+	if (horse->isTamed() || horse->rider.lock() == nullptr) return false;
 	Vec3 *pos = RandomPos::getPos(dynamic_pointer_cast<PathfinderMob>(horse->shared_from_this()), 5, 4);
-	if (pos == NULL) return false;
+	if (pos == nullptr) return false;
 	posX = pos->x;
 	posY = pos->y;
 	posZ = pos->z;
@@ -33,7 +33,7 @@ void RunAroundLikeCrazyGoal::start()
 
 bool RunAroundLikeCrazyGoal::canContinueToUse()
 {
-	return !horse->getNavigation()->isDone() && horse->rider.lock() != NULL;
+	return !horse->getNavigation()->isDone() && horse->rider.lock() != nullptr;
 }
 
 void RunAroundLikeCrazyGoal::tick()