- fix (and enable) one-key-plugin; fix movieplayer-plugin
- plugins: cleanup

* drop PLUGINDIR_USB
* drop unused 'param' from startPlugin
Merge remote-tracking branch 'cool-next-cc/next-cc'

Conflicts:
	data/locale/deutsch.locale
	data/locale/english.locale
	src/gui/movieplayer.cpp
	src/gui/plugins.cpp
	src/neutrino.cpp
	src/system/locals.h
	src/system/locals_intern.h