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/Tutorial/ProgressFlagTask.h

@@ -17,7 +17,7 @@ private:
 	EProgressFlagType m_type;
 public:
 	ProgressFlagTask(char *flags, char mask, EProgressFlagType type, Tutorial *tutorial ) :
-	TutorialTask(tutorial, -1, false, NULL ),
+	TutorialTask(tutorial, -1, false, nullptr ),
 		flags( flags ), m_mask( mask ), m_type( type )
 	{}