Support Zsh Plugin Standard about zgenom HOT 6 CLOSED

I think that it should be in ~/.zgen.

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Thanks for interest in implementing the standard. The answers to your questions:

• $ZERO – it allows to have the options posix_argzero or function_argzero set,
• $ZPFX – the plugin might still test for the parameter in it's body, plus implementing it is very easy,
• *_unload – yes, so it might not implement this feature; however implementing a zgen unload … call would be a nice addition to zgen and it would allow to unload e.g.: agkozak theme (it implements the unload function).

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Would the ZPFX be a prefix somewhere in the filesystem or would it be in the realm of zgenom?
Because the former would have to be OS specific.

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@psprint I've added most of the zsh plugin standard.

I'm don't like 3. Binaries Directory that much. In my opinion bin is a too common name to automatically add it to the $PATH.
When writing a plugin I'd naturally create a folder bin to store all internal executables and wouldn't expect the plugin manager to automatically add it to the $PATH.

If the user of zgenom wants this behavior they can choose to do so by adding zgenom bin <repo> to their zsh config.
Maybe I'll add an option to enable rule 3.

Apart from 3. I haven't implemented 4-6 since they don't apply (yet).

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Just a side note: topgrade (see here: https://github.com/r-darwish/topgrade/blob/547df8d346e8a7689213299f6fbb1d5807988b44/src/steps/zsh.rs#L72) uses the existence of the ZPFX directory to determine if zinit is installed and fails if it isn't.

I already opened a MR there to use some other env var, but also wanted to mention it here. especially, since I wasn't able to understand the reason for setting ZPFX here as well.

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@svenXY the author of zinit described it here:
https://zplugin.readthedocs.io/en/latest/zsh-plugin-standard/#446_global_parameter_with_prefix_for_make_configure_etc

While zinit is probably the most popular plugin manager supporting ZPFX it's not an indicator for zinit and was meant to be provided by other plugin managers.

When I implemented the standard (and with it ZPFX) I was under the impression that this pattern was widely used. In the end I think it was only used by the author of zinit and the standard.
But I also don't see a point in removing it.

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