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/PrimedTnt.cpp

@@ -33,7 +33,7 @@ PrimedTnt::PrimedTnt(Level *level, double x, double y, double z, shared_ptr<Livi
 
 	setPos(x, y, z);
 
-	float rot = (float) (Math::random() * PI * 2);
+	float rot = static_cast<float>(Math::random() * PI * 2);
 	xd = -sin(rot) * 0.02f;
 	yd = +0.2f;
 	zd = -cos(rot) * 0.02f;
@@ -105,7 +105,7 @@ void PrimedTnt::explode()
 
 void PrimedTnt::addAdditonalSaveData(CompoundTag *entityTag)
 {
-	entityTag->putByte(L"Fuse", (byte) life);
+	entityTag->putByte(L"Fuse", static_cast<byte>(life));
 }
 
 void PrimedTnt::readAdditionalSaveData(CompoundTag *tag)