Don't force the skin action for some static resources

For example I've noticed that the following resources are pulled with forceSkinAction set to true:

• In macros.vm

#set ($url = $xwiki.getSkinFile('icons/xwiki/noavatar.png', true))

• In Main.Activity lots of resources are pulled using the following (this leads for ex to icons/silk/page_white_add.png being loaded not as a static resource but through the skins action)

$xwiki.getSkinFile($activityActionsMap.get($eventType), true)

• In javascript.vm there are quite a lot of JS files pulled with forceSkinAction (and this is dangerous since velocity is applied!). For example:

$xwiki.jsfx.use('js/scriptaculous/effects.js', true)##

Note that one easy way to find out the full list is to put a conditional breakpoint in api/XWiki.java in the method "public String getSkinFile(String filename, String skin, boolean forceSkinAction, XWikiContext context)" on the following line:

url = urlf.createResourceURL(filename, forceSkinAction, context);

(put as condition for the breakpoint that forceSkinAction is true, and filename ends with "png", "js", etc)