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f2f4b83886
Configuration in `explore` has always been confusing to me. This PR overhauls (and simplifies, I think) how configuration is done. # Details 1. Configuration is now strongly typed. In `Explore::run()` we create an `ExploreConfig` struct from the more general Nu configuration and arguments to `explore`, then pass that struct to other parts of `explore` that need configuration. IMO this is a lot easier to reason about and trace than the previous approach of creating a `HashMap<String, Value>` and then using that to make various structs elsewhere. 2. We now inherit more configuration from the config used for regular Nu tables 1. Border/line styling now uses the `separator` style used for regular Nu tables, the special `explore.split_line` config point has been retired. 2. Cell padding in tables is now controlled by `table.padding` instead of the undocumented `column_padding_left`/`column_padding_right` config 3. The (optional, previously not enabled by default) `selected_row` and `selected_column` configuration has been removed. We now only highlight the selected cell. I could re-add this if people really like the feature but I'm guessing nobody uses it. The interface still looks the same with a default/empty config.nu: 
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.