Add fish-like autocompletion to zsh

Jonas Harerrequested to merge
johar/kde-linux:zsh-autocomplete into master

This adds and configures the following packages:

  • zsh-history-substring-search provides a substring search through history and suggests possible arguments
  • zsh-autosuggestions gives suggestions during typing
  • zsh-syntax-highlighting colors commands based on their syntax

Resolves #521 (closed)

Edited by Thomas Duckworth

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