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/LookAtTradingPlayerGoal.cpp

@@ -3,7 +3,7 @@
 #include "net.minecraft.world.entity.npc.h"
 #include "LookAtTradingPlayerGoal.h"
 
-LookAtTradingPlayerGoal::LookAtTradingPlayerGoal(Villager *villager) : LookAtPlayerGoal((Mob *)villager, typeid(Player), 8)
+LookAtTradingPlayerGoal::LookAtTradingPlayerGoal(Villager *villager) : LookAtPlayerGoal(static_cast<Mob *>(villager), typeid(Player), 8)
 {
 	this->villager = villager;
 }