Add the possiblity to add extra psalm options

[greg0ire]

Where are the tests? Have you added tests? Have you updated the tests? Read the
comment above and the documentation referenced in it first. Write tests!

Maybe not at first but you can't prove it 😛

This allows me to use let g:ale_psalm_langserver_options = '--config="$HOME/.config/psalm/psalm.xml"'

[w0rp]

Cheers! 🍻

Sorry about the delay. I'll get to everything when I'm able.

[greg0ire]

No worries! :)

[w0rp]

I just noticed that all of the options for psalm aren't properly named, so I'm going to change them all to ale_php_psalm_.... Update your settings if you use those options.