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/Stitcher.cpp

@@ -17,7 +17,7 @@ void Stitcher::_init(const wstring &name, int maxWidth, int maxHeight, bool forc
 	// 4J init
 	storageX = 0;
 	storageY = 0;
-	stitchedTexture = NULL;
+	stitchedTexture = nullptr;
 }
 
 Stitcher::Stitcher(const wstring &name, int maxWidth, int maxHeight, bool forcePowerOfTwo)
@@ -78,7 +78,7 @@ void Stitcher::stitch()
 	//TextureHolder[] textureHolders = texturesToBeStitched.toArray(new TextureHolder[texturesToBeStitched.size()]);
 	//Arrays.sort(textureHolders);
 
-	stitchedTexture = NULL;
+	stitchedTexture = nullptr;
 
 	//for (int i = 0; i < textureHolders.length; i++)
 	for( TextureHolder *textureHolder : texturesToBeStitched )
@@ -122,7 +122,7 @@ int Stitcher::smallestEncompassingPowerOfTwo(int input)
 
 bool Stitcher::addToStorage(TextureHolder *textureHolder)
 {
-	for (int i = 0; i < storage.size(); i++)
+	for (size_t i = 0; i < storage.size(); i++)
 	{
 		if (storage.at(i)->add(textureHolder))
 		{