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/RangedAttackGoal.cpp

@@ -40,7 +40,7 @@ RangedAttackGoal::RangedAttackGoal(RangedAttackMob *rangedMob, Mob *mob, double
 bool RangedAttackGoal::canUse()
 {
 	shared_ptr<LivingEntity> bestTarget = mob->getTarget();
-	if (bestTarget == NULL) return false;
+	if (bestTarget == nullptr) return false;
 	target = weak_ptr<LivingEntity>(bestTarget);
 	return true;
 }
@@ -60,7 +60,7 @@ void RangedAttackGoal::stop()
 void RangedAttackGoal::tick()
 {
 	// 4J: It's possible the target has gone since canUse selected it, don't do tick if target is null
-	if (target.lock() == NULL) return;
+	if (target.lock() == nullptr) return;
 
 	double targetDistSqr = mob->distanceToSqr(target.lock()->x, target.lock()->bb->y0, target.lock()->z);
 	bool canSee = mob->getSensing()->canSee(target.lock());