For bottom to know that there are no batteries on the system,
I added the battery::Manager to the options.rs file because
here is the first moment bottom verifies battery configuration
by reading the config file, which may or may not contain the
battery field, but for a better UX, it doesn't matter what bottom
finds in the config file now, if it doesn't retrieve battery data,
it just ignores the battery widget all together.
If needed, it can be adjusted so that if the config file contains
the battery field, it will still show the widget.

I guarded the options.rs in two places for battery module that can be missing in the feature list.

Dynamic battery widget

Revert "Dynamic battery widget"

I added a new option in terminal and in the config
file to be able to change the terminal title with
any custom one. The user can now add `--title` and
the custom title after it or add the `title_to_hostname`
field in the config file to set the terminal's name
to hostname. If there is no option found, then
the name of the terminal will be set to "Bottom".

the name of the terminal, it will be set as before
to its path.

This behaviour will happen when an error happens
inside the `get_use_terminal_name` function as well.

I removed the custom title option for terminal and made it use
the hostname when `--title` is used. The title always contains `btm` now.
If `--title` or `title_has_hostname = true` (in config file) is not present,
then the terminal has the previous behaviour.