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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.

I found this quite annoying not being in this theme after switching from gentoo-theme, it's helpful and it doesn't detract from simplicity.

The PROMPT building method clashes with other themes and
plugins that modify the PROMPT variable.

Also reverted the $jobstates trick due to it not working
inside $PROMPT.

* agnoster: improve perf with use of $jobstates (zsh/parameter module)

This saves multiple fork/execs (for the subshell and wc) each
time the prompt is rendered

* agnoster: compute git repo_path only when in a git repo

this avoids needlessly invoking git twice every time we render the prompt

* agnoster: avoid subshell when rendering prompt

Rather than forking a subshell to print the prompt, construct it
incrementally by appending to $PROMPT.

v2: fix incorrect CURRENT_BG
v3: fix bzr and hg prompting

Thanks @mcornella for the help.

* Fix branch not updating on checkout in steeef

* Check for `hub` in steeef when switching branches

Fixes #6758