Analyzer: Replace StartMode with a useStartupProject boolean

This is what it is on the top level. The change makes it obvious
that in the valgrind(-derived) plugins the value is later wrongly
used to make a decision on whether to run the valgrind process
locally or remotely. But that's isolated in valgrind now and
can be fixed there.

Change-Id: I6fa5e669dec1f9e2cdebe42a1591d15144082a21
Reviewed-by: Anton Kreuzkamp <anton.kreuzkamp@kdab.com>
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>
Reviewed-by: Ulf Hermann <ulf.hermann@theqtcompany.com>

src/plugins/ios/iosanalyzesupport.cpp

@@ -86,7 +86,6 @@ RunControl *IosAnalyzeSupport::createAnalyzeRunControl(IosRunConfiguration *runC
     AnalyzerStartParameters params;
     params.runMode = QmlProfilerRunMode;
     params.sysroot = SysRootKitInformation::sysRoot(target->kit()).toString();
-    params.startMode = StartLocal;
     params.debuggee = runConfig->localExecutable().toUserOutput();
     params.debuggeeArgs = Utils::QtcProcess::joinArgs(runConfig->commandLineArguments());
     params.analyzerHost = QLatin1String("localhost");