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/ZoneFile.cpp

@@ -23,7 +23,7 @@ ZoneFile::ZoneFile(int64_t key, File file, File entityFile) : slots(slotsLength)
 //        this.entityFile = new NbtSlotFile(entityFile);
 //    }
 
-    channel = CreateFile(wstringtofilename(file.getPath()), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+    channel = CreateFile(wstringtofilename(file.getPath()), GENERIC_READ | GENERIC_WRITE, 0, nullptr, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
 	// 4J - try/catch removed
 //    try {
         readHeader();