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.Client/Common/GameRules/GameRuleDefinition.cpp

@@ -50,7 +50,7 @@ GameRuleDefinition *GameRuleDefinition::addChild(ConsoleGameRules::EGameRuleType
 #ifndef _CONTENT_PACKAGE
 		wprintf(L"GameRuleDefinition: Attempted to add invalid child rule - %d\n", ruleType );
 #endif
-	return NULL;
+	return nullptr;
 }
 
 void GameRuleDefinition::addAttribute(const wstring &attributeName, const wstring &attributeValue)