Add OmniSharp for dotnet support

This uses the .NET 6 (and above) native .NET, rather than configuring
Mono. To do this, we need to configure OmniSharp and also ensure
`DOTNET_ROOT` is set correctly for everything to work.

OmniSharp/omnisharp-vim#832
https://stackoverflow.com/a/72225758
https://stackoverflow.com/a/73896444

Brewfile

@@ -74,6 +74,7 @@ cask "bartender"
 cask "choosy"
 cask "chromedriver"
 cask "datagrip"
+cask "dotnet-sdk"
 cask "fantastical"
 cask "font-jetbrains-mono-nerd-font"
 cask "google-chrome"

vim/ftplugin/cs.vim

@@ -0,0 +1 @@
+let g:OmniSharp_server_use_net6 = 1

vimrc.bundles

@@ -21,15 +21,17 @@ let g:has_async = v:version >= 800 || has('nvim')
 call plug#begin('~/.vim/bundle')
 
 " Define bundles via Github repos
+Plug 'OmniSharp/omnisharp-vim'
 Plug 'airblade/vim-gitgutter'
 Plug 'bogado/file-line'
 Plug 'ctrlpvim/ctrlp.vim'
 Plug 'dense-analysis/ale'
 Plug 'janko-m/vim-test'
 Plug 'jeffkreeftmeijer/vim-dim'
 Plug 'mattn/vim-lsp-settings'
-Plug 'pbrisbin/vim-mkdir'
 Plug 'nickcharlton/vim-pandoc-syntax', { 'branch': 'neovim-compat' }
+Plug 'nickspoons/vim-sharpenup'
+Plug 'pbrisbin/vim-mkdir'
 Plug 'prabirshrestha/asyncomplete-file.vim'
 Plug 'prabirshrestha/asyncomplete-lsp.vim'
 Plug 'prabirshrestha/asyncomplete.vim'

zsh/configs/post/exports.sh

@@ -22,3 +22,6 @@ export PATH=$PATH:$ANDROID_HOME/emulator
 export PATH=$PATH:$ANDROID_HOME/tools
 export PATH=$PATH:$ANDROID_HOME/tools/bin
 export PATH=$PATH:$ANDROID_HOME/platform-tools
+
+# dotnet
+export DOTNET_ROOT=/usr/local/share/dotnet