Add SMODS.get_clean_pool

[the-Astra]

A simple helper function that returns the current specified pool without any 'UNAVAILABLE' values. Takes the same arguments as vanilla's get_current_pool

Additional Info:

• I didn't modify api's or I've made a PR to the wiki repo.
• I didn't modify api's or I've updated lsp definitions.
• I didn't make new lovely files or all new lovely files have appropriate priority.

[nh6574]

I think it should make a new list instead of replacing all values with nil, no? I also don't think it's good practice to remove values don a table while iterating on it but I assume it works in this case.

[the-Astra]

I think it should make a new list instead of replacing all values with nil, no? I also don't think it's good practice to remove values don a table while iterating on it but I assume it works in this case.

Doing a new list is probably better. The reason I did the iteration method is because doing it in a for...in ipairs loop would cause skips on consecutive unavailable objects, but this will be moot when I make it return a new list