First tries...
First tries
Added toggle functionality for headercontent
-added defaultvalues for headers beeing collapsed or not -added css for mac - moved css to right file
- fixed showing cached headers
- fixed viewsource taking it's own row
- fixed some coding style issues as requested
- merged two same if-statements to one ^^
- current state is saved back to the preferences now
- fixed opened-twisty not showing
- adapted names of the preferences
- fixed coding-styling issues
Merge remote-tracking branch 'upstream/master' into issue4930

Conflicts:
	extension/skin/classic/win/panel.css
Merge pull request #96 from kaljak/issue4930

Issue 4930 (Headers in net requests should be collapsible)
http://code.google.com/p/fbug/issues/detail?id=4930