* Created `Runner` command
* Remove unnesessary temp variable
* Created `AutoRunner` command
`AutoRunner` command executes the `Runner` command every time a file is saved.
* Updated formatting
* Fix descriptions
* Created `AutoRunnerStop` command
`AutoRunnerStop` - stops `AutoRunner` and closes its window
* Automatic formatting
* Added command description to readme
* Update table
Added lua command column to "Commands" table.
* Update function description
Specified that `autorun` can accept buffer number as an argument.
* Fix `autorun` function
When saving a file, now function now checks if `_terminal_windows` exists and call the last shell command, otherwise it calls the vim command.
* Moved `user_commands`
`user_commands` now are created when `setup()` is called.
* Fix README
Removed the line stating that the `setup()` function in optional.
