better handling the settings window; now the window is only created when the user clicks on the button, so it won't be shown anymore for non-moderator participants
Merge branch 'guest-role-0.81' into mconf-live0.4

Conflicts:
	bigbluebutton-client/branding/default/style/css/BBBDefault.css
	bigbluebutton-client/src/org/bigbluebutton/common/Images.as
	bigbluebutton-client/src/org/bigbluebutton/main/views/MainApplicationShell.mxml
fixed the tabIndex on the MainToolbar; few adjustments to make it looks better (centralize buttons and bars)