Add vim/ftplugin; oh-my-zsh.sh; c.vim.

Add:
	vim/ftplugin/
		-personal ftplugin files, mostly to contain syntax matches and
		highlighting; directory is symlink'd from ~/.vim/after/ftplugin

	vimrc-after
		-remove all syntax matches (arithmetic, logic, bitwise operators, etc.),
		and gradually migrate them to the filetype-specific files (in
		vim/ftplugin/) of languages that I currently use; this prevents
		unnecessary or incorrect syntax matching that either don't use said
		operators, for instance, or reserve special meaning for them.

	zsh/oh-my-zsh.zsh
		-zsh file containing oh-my-zsh configuration; sourced by zshrc