Yet more incremental improvements

- Added `ZeplTerminalWinOpen` auto-command that will run when the REPL
  window first opens.
- Made `rlwrap` artefacting fix optional with the `rlwrap` key in
  `b:repl_config` to resolve issues with other REPLs.
- Don't `startinsert` in Neovim terminal when `:keep` mod was used.
- Documentation updates.

Further incremental enhancements

- Added `:keep` mod to `:Repl` to keep the current buffer focused.
- Fixed bug with multiple mods on `:Repl` not working as expected.
- Disabled restoration of REPL buffers so Zepl works better with the
  `:mksession` command.
- Added zepl-blocks contrib extension for sending pre-defined regions to
  the REPL.
- Documentation updates and fixes.

Major bug fix and F# custom formatter

- Fixed bug where `rlwrap` usage would cause artefacting in Vim's
  `:terminal`.
- Added `zepl-fsharp` custom formatter contrib extension.
- Very minor docs update.

Various contrib extension improvements

- Added `zepl#config()` function.
- Added `:help zepl-nvim_autoscroll_hack` contrib extension.
- Updated `:help zepl-load_files` contrib extension to also use
  `g:repl_config`.
- Updated `:help zepl-control_characters` contrib extension.

Global REPL configuration and updated/new contrib extensions

  * Added global REPL configuration through the 'g:repl_config' variable.
  * New/updated contrib extensions.  (See |zepl-contrib|.)

Bug fixes and documentation overhaul

  * Improved newline handling.
  * Documentation overhaul.
  * Improved naming of <Plug> mappings.

First stable and feature-complete version

- Added Neovim support.
- Added MS Windows support.
- Introduction of zepl-contrib.
- Custom formatters (zepl.vim now supports Python -- through
  zepl-contrib).
- Send text to REPL verbatim (disables formatters).
- Made public function API stable.
- Cleaned up some of the codebase and improved documentation.

Initial public release