Version 1.0.0

- Refactor many autoload functions
- Speed up boot time by moving autoload functions used at loading ftplugins
- Add commands with `!` that is executed even if the current buffer is modified
- Show splicing end locations in `:GhcModExpand`
- Fix escaping in `:GhcModInfoPreview`
- Fix ignorance of `g:ghcmod_ghc_options`