Update activity.php

Do not return every time, otherwise all triggers like onBeforePost will just work on the first plugin and not on the other.
This patch will not fix the compatibility with the existing plugins because some are returning "true" for generic triggers.
It is also possible to get all values and return a merge of these, but the __call function must call every activity plugins.
Trashed menu items on Kunena Configuration details #2588
Update activity.php

Return the first value we got during the call of the instances.
(in order to keep the compatibility with the previous modification of the function, to use a trigger in order to get the number of points or medals)
Attachments with spaces in file name are overwritten #2576
Trash Manager - Purge items: it missing the Cancel button #2616
Show attachment miniature on Jomsocial activity stream instead text
K3.0.6 improve hidden

better layout for hidden bbcode function
[master][3.0.6] Polls will removed if you edit the following posts #2619
Merge pull request #2615 from xillibit/k30_bugs16

Increase version number
Merge pull request #2623 from 810/patch-6

K3.0.6 improve hidden
Merge pull request #2617 from xillibit/k30_bugs2

Trash Manager - Purge items: it missing the Cancel button #2616
Merge pull request #2580 from obsidev/patch-2

Activity Integration don't call every activity plugins
Merge pull request #2613 from xillibit/k30_bugs11

Attachments with spaces in file name are overwritten #2576
[master][3.0.7] Trash Manager - Topics : Select all it marks only 2 topics
Trash Manager - Purge Messages : Back button return to topics #2638
Merge pull request #2639 from xillibit/k30_bugs2

Trash Manager - Purge Messages : Back button return to topics #2638
Merge pull request #2589 from xillibit/k30_bugs8

Trashed menu items on Kunena Configuration details #2588
Merge pull request #2626 from xillibit/k30_bugs18

[master][3.0.6] Polls will removed if you edit the following posts #2619
Merge pull request #2621 from xillibit/k30_bugs17

Show attachment miniature on Jomsocial activity stream instead text
[master][3.0.6] Ebay doesn't work anymore #2645