Deprecate wp_explain_nonce()

[nacin]

wp_explain_nonce() was nice to have when everything was being converted over to nonces back in the 2.0.x days. However it is no longer necessary, is woefully outdated, and translators dislike the large chunk of strings. At this point it is safe to remove it in favor of generic strings in wp_nonce_ays().

[nacin]

In [21133]:

Deprecate wp_explain_nonce(). fixes #21076.

[nacin]

In [21140]:

Deprecate wp_explain_nonce(). see #21076 for 3.4.

[nacin]

In [21144]:

Deprecate wp_explain_nonce(). see #21076 for 3.3.

[nacin]

In [21146]:

Update the version numbers for wp_explain_nonce() deprecation. see #21076.