use header for plugins pref
Merge branch 'master' of github.com:jonatkins/ingress-intel-total-conversion
removed not used namespace
made the plugin prefs container static. finished plugin headers. this has multiple advantages:
1) it is enough to parse the plugins only on first start of this
activity (not on every start of the preferences or this activity)
2) actionbar control (not possible with nested preferences)
3) it looks more fancy on tablets