all manifests unified and fixed

[tworec]

Initiative was to fix this https://github.com/golemfactory/golem-unlimited/pull/205#issuecomment-487295880

I've ended up with cleaning, unifiyng and fixing all manifests, especially for clinfo feature

Standard:

• section sort: package, deps, dev-deps, features, other
• deps sort: internal deps lexical sorted, other deps lexical sorted
• all quotes as "
• spaces around quotes, equal signs, and curly braces

Further cleanup:

• serde derive unification (feature derive for serde instead of separate crate serde_derive usage)
• #[allow(dead_code)] elimination
• most of unused code removal (incl. whole gu-webapp crate)
• fixed unused Version module for gu-hub