Rem standard.vim ftpackage; move to vimrc_after.

Rem:
	vimrc_after, vim/ftpackage/standard.vim
		-The `standard` ftpackage contained excessively general rules
		that apply to virtually all filetypes; thus, it should be
		opt-out as opposed to opt-in. Remove `standard.vim`, and move
		its contents to `vimrc_after`.

	vim/ftplugin/*
		-Remove `Ftpackage standard`.