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/Network/Sony/SQRNetworkPlayer.h

@@ -63,7 +63,7 @@ class SQRNetworkPlayer
 	public:
 		DataPacketHeader() : m_dataSize(0), m_ackFlags(e_flag_AckUnknown) {}
 		DataPacketHeader(int dataSize, AckFlags ackFlags) : m_dataSize(dataSize), m_ackFlags(ackFlags) { }
-		AckFlags GetAckFlags() { return (AckFlags)m_ackFlags;}
+		AckFlags GetAckFlags() { return static_cast<AckFlags>(m_ackFlags);}
 		int GetDataSize() { return m_dataSize; }
 	};