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Use add-zsh-hook to add functions to hooks. That way they won't be added again
when doing `source ~/.zshrc` multiple times.
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

* Update http to https in Solarized
* Upgrade http to https for 'Burger In Your Shell'
* Upgrade http to https for tmux.github.io

Now it can be sourced in a function, like zplug.

- Add mercurial support to af-magic, so now the vcs prompt will show up in either a git or hg repository
- The virtualenv prompt was white and bumped up against the user@hostname output
- Fixed that so its green (which I thought highlighted it more thematically) and has a space before user@hostname

This reverts commit 59c1ec80.

Fixes #7985

Changes themes displaying RVM or other Ruby version info to use the central
ruby_prompt_info function. This supports more Ruby versioning mechanisms,
reduces copy-and-paste code, and avoids "zsh: no such file or directory: rvm-prompt"
when run on machines that do not have RVM installed.

Changes the prefix/suffix variable names to ZSH_THEME_RUBY_PROMPT_PREFIX and
ZSH_THEME_RUBY_PROMPT_SUFFIX, since they apply to all Ruby versioning mechanisms,
not just RVM.

Allows empty ZSH_THEME_RUBY_PROMPT_PREFIX and ZSH_THEME_RUBY_PROMPT_SUFFIX.

Fixes #7483
Closes #4973

Fixes #6116

%_ is a prompt expansion sequence that expands to the status of the parser.
This means that on window resize, the status of the execution of the
window resize hook (TRAPWINCH) would be displayed while reloading the
prompt line. This looked like cmdand cursh$ or then$ depending on the
body of the TRAPWINCH function.

Fixes #7262

Fixes #7268

With `$USER`, we'd need to quote it in case special characters like `\` are present in
the $USER value, like if the user is part of an AD domain.

With `%n` the quoting is done automatically by zsh.
See http://zsh.sourceforge.net/Doc/Release/Prompt-Expansion.html#Login-information

These themes used an adhoc substitution of $HOME for tilde
in $PWD, but it's better to use '%~' and is less error prone.

See #7160

This PR fixes the runtime error that displays this:

```log
prompt_status:2: symbols: attempt to assign array value to non-array
```.

It trips over a local array which is not properly declared.

* theme/fino: Check rvm-prompt is installed before to try to use it
Signed-off-by: Nick Diego Yamane <nick.diego@gmail.com>

* theme/fino-time: Check rvm-prompt is installed before to try to use it
Signed-off-by: Nick Diego Yamane <nick.diego@gmail.com>

This version splits the `$PWD` by the slashes and prints the path
directory by directory, printing the separators as before.

Also refactor the logic

Checking if the terminal supports 256 colors is better suited for
our purpose. Checking if `$DISPLAY` is set doesn't tell us if our
colors will be displayed correctly.

Used color encodings from
https://metacpan.org/source/WOLDRICH/Term-ExtendedColor-0.224/lib/Term/ExtendedColor.pm

* agnoster: do not hardcode black foreground.

This would allow easy customization when using light color schemes, like
solarized-light

* agnoster: implement light theme variant

Use same variable as in blinks theme, to detect if solarized theme used
is a light or dark one.

* use https everywhere

* use https links on the files that are left

Also, removed some broken links and updated redirections.