Remove all uses of extract() within bbPress

[johnjamesjacoby]

See ​http://core.trac.wordpress.org/ticket/22400 for WordPress core equivalent.

extract() is error prone and ugly, so lets get rid of it in 2.3.

[johnjamesjacoby]

(In [4480]) Extract:

• Remove extract() calls from some statistics functions.
• See #2056.

[johnjamesjacoby]

(In [4481]) Extract:

• Remove extract() from bbp_filter_anonymous_post_data().
• See #2056.

[johnjamesjacoby]

(In [4482]) Extract:

• Remove extract() from bbp_wp_login_action().
• See #2056.

[johnjamesjacoby]

(In [4483]) Extract:

• Remove extract() from bbp_get_breadcrumb().
• Other general code cleanup.
• See #2056.

[johnjamesjacoby]

(In [4484]) Extract:

• Remove extract() from bbp_get_the_content().
• Other general code cleanup.
• See #2056.

[johnjamesjacoby]

(In [4485]) Extract:

• Remove extract() from bbp_get_dropdown().
• Other general code cleanup.
• See #2056.

[johnjamesjacoby]

(In [4486]) Extract:

• Remove extract() from bbp_update_reply_revision_log().
• Other general code cleanup.
• See #2056.

[johnjamesjacoby]

(In [4487]) Extract:

• Remove extract() from bbp_create_initial_content().
• See #2056.

[johnjamesjacoby]

(In [4488]) Extract:

• Remove extract() from bbp_update_forum().
• See #2056.

[johnjamesjacoby]

(In [4490]) Extract:

• Remove extract() from bbp_update_topic_revision_log().
• See #2056.

[alexvorn2]

what about widgets.php?

[johnjamesjacoby]

(In [4493]) Extract:

• Remove extract() from widgets.
• See #2056.

[johnjamesjacoby]

(In [4497]) Extract:

• Remove extract() from extra statistics page template.
• See #2056.

[johnjamesjacoby]

(In [4498]) Extract:

• Remove extract() usages from /users/template-tag.php.
• See #2056.

[johnjamesjacoby]

(In [4499]) Extract:

• Remove extract() from bbp_check_for_duplicate().
• Improve code in bbp_check_for_duplicate() to support this.
• See #2056.

[johnjamesjacoby]

(In [4501]) Extract:

• Remove unused BBP_Forum_Walker class, and bbp_walk_forum function, that use extract().
• See #2056.

[johnjamesjacoby]

(In [4502]) Extract:

• Remove extract() from bbp_get_single_forum_description().
• See #2056.

[johnjamesjacoby]

(In [4503]) Extract:

• Remove extract() from bbp_list_forums().
• See #2056.

[johnjamesjacoby]

(In [4506]) Extract:

• Remove extract() usages from /topics/template-tags.php.
• See #2056.

[johnjamesjacoby]

(In [4507]) Extract:

• Remove extract() usages from /replies/template-tags.php.
• See #2056.

[johnjamesjacoby]

(In [4508]) Extract:

• Clean up bbp_parse_args() usages and inline documents.
• Fixes #2056.