Add old-omz-completion plugin

plugins/old-omz-completion/README.md

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+## Description
+
+This plugin restores the original oh-my-zsh completion.  Hyphen, underscore and dot are treated as wildcards.
+
+For example `cd /etc/i.d TAB` would expand to `/etc/init.d`.  The new completion (introduced last year) breaks this completion stlye.
+
+For more info see:
+
+https://github.com/robbyrussell/oh-my-zsh/issues/5560

plugins/old-omz-completion/old-omz-completion.plugin.zsh

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+zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'r:|[._-]=* r:|=*' 'l:|=* r:|=*'