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Closes #4616
Changes the `plugins=(... mercurial ...)` to be closer to correct zsh syntax, removing commas and extra spaces.
Revises discussion on configuring themes to avoid sounding like users should modify the theme definition file in the main OMZ folder. Prioritizes the suggestion of using a theme which already supports hg_prompt_info.

* `cfp` alias was referencing an old version of the `cf` command which
no longer exists. This has been updated to reference a valid command.

Check pyenv-virtualenv can eval before use it.
Signed-off-by: Superbil <superbil@gmail.com>

Fixes bug introduced in #4440

Removing legacy rails-specific aliases from the Textmate plugin. This is probably best handled as a custom plugin.

This changes all the __git_* functions it was defining to __gitex_* to avoid collisions with the internal functions used inside _git from zsh.

The Atom plugin is obsolete.

See #3193

Currently, encode64 plugin using `echo -n` to print the content
of $1 variable. This approach will not work with arbitrary data,
which contains sequence of escaped characters, since when many
`echo` implementation will expand them.

This commit chage the usage to `printf`, which is builtin in all
POSIX shells and can print arbitrary data reliability.

Fixed indentation

Fixed indentation

Added function to display the song you're currently listening to in iTunes

Fixed indent

Indentation on line 169 was squiffy

Fixed spelling

Removed unnecessary wording to make function more succinct.

Highlighting of Artist and Track

Changed the highlighting of the Track and Artist in yellow to make use of Prompt Expansion Colors