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/MemoryLevelStorage.cpp

@@ -14,7 +14,7 @@ MemoryLevelStorage::MemoryLevelStorage()
 
 LevelData *MemoryLevelStorage::prepareLevel()
 {
-	return NULL;
+	return nullptr;
 }
 
 void MemoryLevelStorage::checkSession() 
@@ -54,7 +54,7 @@ bool MemoryLevelStorage::load(shared_ptr<Player> player)
 
 CompoundTag *MemoryLevelStorage::loadPlayerDataTag(const wstring& playerName) 
 {
-	return NULL;
+	return nullptr;
 }
 
 ConsoleSavePath MemoryLevelStorage::getDataFile(const wstring& id)