Search engine for spaces

[Spiky-73]

As it's said in the title, I think it could be a good addition to have a custom search engine for spaces similar to the one for tabs (%) and bind it to a specific prefix ($, /, ...).

With the removal of the old popup to manually chose spaces in v1.13b, I think this could be a great replacement, and it would allow users to search their spaces by name.

[Topech]

I also would love this. I think $, &, :, -, . as prefixes are some good options