Modernize project codebase (#906)

* 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

* Add safety checks and fix a issue with vector going OOR

Minecraft.Client/Common/GameRules/LevelGenerationOptions.h

@@ -167,7 +167,7 @@ private:
 	bool m_bLoadingData;
 
 public:
-	LevelGenerationOptions(DLCPack *parentPack = NULL);
+	LevelGenerationOptions(DLCPack *parentPack = nullptr);
 	~LevelGenerationOptions();
 
 	virtual ConsoleGameRules::EGameRuleType getActionType();
@@ -202,7 +202,7 @@ public:
 	LevelRuleset *getRequiredGameRules();
 
 	void getBiomeOverride(int biomeId, BYTE &tile, BYTE &topTile);
-	bool isFeatureChunk(int chunkX, int chunkZ, StructureFeature::EFeatureTypes feature, int *orientation = NULL);
+	bool isFeatureChunk(int chunkX, int chunkZ, StructureFeature::EFeatureTypes feature, int *orientation = nullptr);
 
 	void loadStringTable(StringTable *table);
 	LPCWSTR getString(const wstring &key);