[maint]: improve readability of Zinit source code

[vladdoster]

Summary

Inconsistent line length & wrapping, making it hard to read, grok, and edit Zinit.

Examples:

1. zinit-install.zsh#L4
2. zinit-install.zsh#L995
3. zinit-install.zsh#L1848

Proposed fix

Add the following Vim Modeline to all Zinit source code:

vim: ft=zsh et ts=2 sw=2

[pschmitt]

Given the overall line length, I'd consider ts=2 sw=2

[vladdoster]

@pschmitt agreed.

Ive attempted formatting bits here and there, but is really tedious. Additionally, we need to find a way to enforce Zsh formatting. Do you know of any formatting tools for Zsh? To seriously consider shfmt would require changing all the conditional blocks to the more traditional bash syntax.

Edit: updated vim mode-line from 4 -> 2

[vladdoster]

Progress

PR	File
#318	share/git-process-output.zsh
#319	share/rpm2cpio.zsh
#325	share/single-line.zsh
	_zinit
	zinit-additional.zsh
	zinit-autoload.zsh
	zinit-install.zshsh
	zinit.zsh