Add auto-select mode to nuker

[LittleApple-fp16]

Type of change

• [ ] Bug fix
• [x] New feature

Description

Added a new whitelist mode 'AutoSelect'. It can just select the block you are looking at when active. This is convenient when using keybind to mine specific blocks and also can be switched through activation.

Related issues

Mention any issues that this pr relates to.

How Has This Been Tested?

It works on my local test.

Checklist:

• [x] My code follows the style guidelines of this project.
• [x] I have added comments to my code in more complex areas.
• [x] I have tested the code in both development and production environments.