Core: Add some sanity check that settings containers don't auto-apply

We use manual 'Apply' in the dialog.

Also, mark a few pages as non-autoapply that were recently changed
away from PagedSettings again which did that autmatically.

Change-Id: Id78cac2770658b18c420813802a0e77443329f39
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/terminal/terminalsettings.cpp

@@ -362,6 +362,7 @@ TerminalSettings &settings()
 TerminalSettings::TerminalSettings()
 {
     setSettingsGroup("Terminal");
+    setAutoApply(false);
 
     enableTerminal.setSettingsKey("EnableTerminal");
     enableTerminal.setLabelText(Tr::tr("Use internal terminal"));