reorganize features a bit

[fdncred]

Description

I think zip-support needs to be part of default since it's used in to html (part of extracting themes from the binary), and i think trash-support should be part of default, just because. which would leave only dataframes in extra. let me know if you disagree.

also changed lto to thin

Tests

Make sure you've run and fixed any issues with these commands:

• cargo fmt --all -- --check to check standard code formatting (cargo fmt --all applies these changes)
• cargo clippy --all --all-features -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect to check that you're using the standard code style
• cargo build; cargo test --all --all-features to check that all the tests pass