Added 2.4 style z-covers with hidden cable routing

[Akio-42]

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Which mods/configurations/profiles are added by this PR?

The current mod of the z-covers with hidden cable routing is in the style of the v2.2. I got the request to also do the mod for the 2.4 style z-covers. This pull request contains the 2.4 style z-covers with hidden cable routing. Current files were renamed to make it easy to distinguish the style and documentation was updated. I also added more information and some best practices to the documentation.

How was it tested?

Printed and installed on my 2.4.

Any background context you want to provide?

Screenshots (if appropriate)

Further notes

[newphreak]

Just for the sake of it, rename the files from v22 and v24 to v2.2 and v2.4.
V24 is a real printer. The rest looks great.

[Akio-42]

Changed file names and adapted the readme...

[Akio-42]

It's been a while. Anybody still looking at this?

[Akio-42]

@FHeilmann
Added a rail notch version for the z-belt covers in both versions (2.2 and 2.4) and udpated the description. Thanks again for tagging me in the issue. Had not been aware of it.