Nushell 0.61: Completion Descriptions, env.nu, and New Features

Completions now show you a description of the command you're completing, if it's available. # Introducing 'env.nu' (kubouch) Just as we added 'config.nu' with 0.60, we're now adding a new additional startup file called 'env.nu'. The job of this file is to set up the environment that you'll run Nushell in. As a result, you're able to set up important environment variables like `$env.NU_LIB_DIRS` before 'config.nu' begins to run, let you take full advantage of the new library directories you've configured. # Features - `input` can now [suppress output](https://github.com/nushell/nushell/pull/5017) (dev-msp) - [Termux/Android target support for new engine](https://github.com/nushell/nushell/pull/4956) (dscottboggs) - `open` can now use [`from ...` named custom commands](https://github.com/nushell/nushell/pull/5049) (neosam) - New [`sort` command for easier sorting](https://github.com/nushell/nushell/pull/5054) (sophiajt) - `date to-record` for [working with structured dates](https://github.com/nushell/nushell/pull/5058) (sophiajt) - New [starts-with operator](https://github.com/nushell/nushell/pull/5061) (fdncred) - Can now create [generic menus for repl interactions](https://github.com/nushell/nushell/pull/5085) (elferherrera) - New [`glob` command for fancier globbing](https://github.com/nushell/nushell/pull/5087) (fdncred) - [Unary `not` support](https://github.com/nushell/nushell/pull/5111) (sophiajt) - Startup and pre-prompt setup should now be [significantly faster](https://github.com/nushell/nushell/pull/5115) (sophiajt) - [`0b[...]` support for binary literals](https://github.com/nushell/nushell/pull/5149) (merkrafter) # Improvements - Parser improvements by uasi, sophiajt, rgwood - Error improvements by jmoore34, sophiajt, rgwood - Documentation updates by hustcer, vishalsodani, fdncred, futile, kubouch, stormasm, Hofer-Julian, herlon214, rgwood, michel-slm - General code cleanliness fixes by stormasm, bowlofeggs, rgwood, sholderbach, fdncred, herlon214, elferherrera, boyvanduuren, sophiajt

Nushell 0.61 introduces completion descriptions in the shell, providing information about commands as they are being completed. A new 'env.nu' startup file is added to set up the environment before 'config.nu' runs. New features include suppressing output with 'input', Termux/Android support, 'open' command improvements, a new 'sort' command, 'date to-record', 'starts-with' operator, generic menus for REPL, 'glob' command, unary 'not' support, faster startup, and binary literal support. There are also numerous parser, error, documentation, and code cleanliness improvements.