Debugger: Rename 'AttachExternal' to 'AttachToLocalProcess'

And AttachCrashedExternal to AttachToCrashedProcess
And AttachCore to AttachToCore.

Clearer.

Change-Id: I47c2eca5cbdbbc0eb38b9f62b2504c96558ff112
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/ios/iosrunner.cpp

@@ -452,7 +452,7 @@ void IosDebugSupport::start()
         }
         setDeviceSymbolsRoot(deviceSdk.toString());
     } else {
-        setStartMode(AttachExternal);
+        setStartMode(AttachToLocalProcess);
         setIosPlatform("ios-simulator");
     }