Add BP dynamic activity actions

[thebrandonallen]

Included patch adds dynamic activity actions for site wide/group forums. Also includes fix for #2690 by @r-a-y.

[thebrandonallen]

Updating patch and adding tests.

[netweb]

Refresh of 2794.02.patch against /trunk

[thebrandonallen]

One more refresh against trunk, plus some documentation improvements.

[johnjamesjacoby]

Patch isn't applying cleanly for me. A refresh would be helpful, or else I'll circle back to this during beta.

[thebrandonallen]

Patch updated for latest trunk.

[johnjamesjacoby]

For some reason, src/includes/extend/buddypress/activity.php still gets skipped.

I'll apply it manually and review that way.

[johnjamesjacoby]

The problem here is that BuddyPress doesn't support filtering of activity items by both component & action.

Because bbPress uses the same action for both group & site-wide forums, this results in duplicate items in the activity drop-down filters (both theme-side and admin-side.)

I'll modify this a bit, and we'll need to also modify BuddyPress if we want this to work differently upstream.

[johnjamesjacoby]

In 6370:

BuddyPress: Dynamic activity for topics & replies, part 1.

• Functions for activity action filters

Props thebrandonallen. See #2794.

[johnjamesjacoby]

In 6372:

BuddyPress: Dynamic activity for topics & replies, part 2.

• Filters for activity action functions
• Tests for the new activity filters

Props thebrandonallen. See #2794.

[johnjamesjacoby]

Pretty sure this is as fixed as we can make it, without a change to BuddyPress.

Closing for the 2.6 milestone. Further enhancements or bugs should be new tickets.

Thanks everyone!