Add F2 screenshot functionality (#1262)

- Updated `EControllerActions` to include `MINECRAFT_ACTION_SCREENSHOT`.
- Added conditional compilation for `stb_image_write.h` in `Minecraft.cpp`.
- Modified `run_middle()` to handle screenshot key press.
- Updated `tick()` to capture and save screenshots as PNG files.
- Introduced `KEY_SCREENSHOT` in `KeyboardMouseInput.h` mapped to F2.
- Added `stb_image_write.h` for image writing capabilities.

Minecraft.Client/Windows64/KeyboardMouseInput.h

@@ -36,8 +36,6 @@ public:
 	static const int KEY_DEBUG_CONSOLE = VK_F6;
 	static const int KEY_HOST_SETTINGS = VK_TAB;
 	static const int KEY_FULLSCREEN = VK_F11;
-
-	// todo: implement and shi
 	static const int KEY_SCREENSHOT = VK_F2;
 
 	void Init();