bookmarks: add explicit option to list bookmarks of the given names This is a generalized form of the --active option. A redundant sorted() call is removed. There was no point to update dict items in lexicographical order.

bookmarks: reject --delete with --inactive which makes no sense A deleted bookmark is neither active nor inactive.

bookmarks: parse out --inactive to action early The --inactive option can't be directly mapped to an action or a modifier. With any names, it means to add/rename to inactive bookmarks. Without names, it means to deactivate the current bookmark. This patch separates them to "inactive" flag and "action == 'inactive'".

bookmarks: parse out implicit "add" action early This prepares for adding -l/--list option, which can be combined with the positional arguments.