Improve don't save bookmark context from encrypted files

Improve don't save bookmark context from encrypted files

* etc/NEWS: Mention 'bookmark-inhibit-context-functions'.
Fix typos.

* lisp/bookmark.el (bookmark-inhibit-context-functions): New defcustom.
(bookmark-make-record): Use it.

* lisp/auth-source-pass.el (auth-source-pass-file-name-p):
* lisp/auth-source.el (auth-source-file-name-p): New defuns.  Add
them to `bookmark-inhibit-context-functions'.

* lisp/epa-hook.el (epa-file-name-p):
* lisp/net/tramp-crypt.el (tramp-crypt-file-name-p): Add them to
`bookmark-inhibit-context-functions'.