Add settings to hide any available types

Hello

Adding settings to hide any possible type could be useful. Each user has different needs or preferences, some might want to see imports, some not. Same goes for all the other types.

I've seen this has been implemented for variables and properties, would be great to have it for every type.

Cheers

No files or tests are named. Start by locating the existing settings for hiding variables and properties, then trace how symbol types are defined and displayed in the Atom structure view. Done means users can independently hide any available type, including imports, while preserving the existing variable and property settings.

Written by the indexing model from the issue text.