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/MobEffectInstance.cpp

@@ -172,8 +172,8 @@ bool MobEffectInstance::equals(MobEffectInstance *instance)
 
 CompoundTag *MobEffectInstance::save(CompoundTag *tag)
 {
-	tag->putByte(L"Id", (byte) getId());
-	tag->putByte(L"Amplifier", (byte) getAmplifier());
+	tag->putByte(L"Id", static_cast<byte>(getId()));
+	tag->putByte(L"Amplifier", static_cast<byte>(getAmplifier()));
 	tag->putInt(L"Duration", getDuration());
 	tag->putBoolean(L"Ambient", isAmbient());
 	return tag;