Add important audio analysis nodes to standard set

[chkw-rks]

Hey! It would be great if FFT4Bands and LinToLog could go into the standard node set of VL.Audio for online video tutorials, would that be possible? They are very handy nodes!

[joreg]

would you be up creating a PR for this?

[chkw-rks]

So these nodes are approved not to be experimental anymore? Because I think I can not make sure they are up to the standards of being in the Standard or Advanced set.

If it is just about moving them out of the Experimental category, I can do that.