refs #312 navigation bars, contributes also to #347

* allow to set/unset frameless mode in CDockWidget
* adjusted context menus
* adjusted style sheets
* ini settings for margins
* hidden info area to host floating widgets only visible when floating (allows to CDockInfoArea widgets)
* made some private slots non-virtual

src/blackgui/qss/gui.ini

@@ -1,5 +1,12 @@
-[infoarea]
-; margins as used in infoarea.cpp
+[alias]
+; those are the component names and valid until an object name is set
+; in most cases the object name is not yet known in the constructor
+; this alias makes sense as long there is one object per component
+CMainInfoAreaComponent = comp_MainInfoArea
+CCockpitInfoAreaComponent = comp_CockpitInfoArea
+CInfoBarStatusComponent = dw_dw_InfoBarStatus
+
+[comp_MainInfoArea]
 margindocked.left = 1
 margindocked.right = 1
 margindocked.top = 1
@@ -8,4 +15,41 @@ margindocked.bottom = 1
 marginfloating.left = 5
 marginfloating.right = 20
 marginfloating.top = 5
-marginfloating.bottom = 20
+marginfloating.bottom = 40
+
+marginfloating.frameless.left = 5
+marginfloating.frameless.right = 5
+marginfloating.frameless.top = 5
+marginfloating.frameless.bottom = 5
+
+[comp_CockpitInfoArea]
+margindocked.left = 1
+margindocked.right = 1
+margindocked.top = 1
+margindocked.bottom = 1
+
+marginfloating.left = 5
+marginfloating.right = 20
+marginfloating.top = 5
+marginfloating.bottom = 40
+
+marginfloating.frameless.left = 5
+marginfloating.frameless.right = 5
+marginfloating.frameless.top = 5
+marginfloating.frameless.bottom = 5
+
+[dw_InfoBarStatus]
+margindocked.left = 0
+margindocked.right = 0
+margindocked.top = 0
+margindocked.bottom = 0
+
+marginfloating.left = 0
+marginfloating.right = 0
+marginfloating.top = 0
+marginfloating.bottom = 0
+
+marginfloating.frameless.left = 0
+marginfloating.frameless.right = 0
+marginfloating.frameless.top = 0
+marginfloating.frameless.bottom = 0