Add debugger engine type to configuration.

Introduce a struct DebuggerItem as a debugger configuration
item, containing debugger engine type and binary. Store
information as a variant map. Add a combo box.

Remove engine guessing logic. Parts of it are still required
when checking the suggested debugger from the SDK.

Split error checking to be able to do a quick error check
and find only valid profiles in the matchers.

Pass on errors up to RunControl::create().

Change-Id: I08653e2a76ca2c371701082f8173b0b8f8ed462e
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/debugger/debuggerdialogs.cpp

@@ -374,8 +374,7 @@ bool StartApplicationDialog::run(QWidget *parent, QSettings *settings, DebuggerS
     }
 
     Kit *kit = dialog.d->kitChooser->currentKit();
-    QTC_ASSERT(kit, return false);
-    fillParameters(sp, kit);
+    QTC_ASSERT(kit && fillParameters(sp, kit), return false);
 
     sp->executable = newParameters.localExecutable;
     sp->displayName = newParameters.displayName();