Remove ApplicationLauncher::Mode

The actual remaining use was to pop up a terminal in some
setups where Mode == Console, with a default of Gui meaning
"no console". In some downstream uses it was used set to
Console (probably to mean "this helper process does not need
a gui") but then luckily ignored when actually starting the
helper processes.

All cases where the console is useful and requested are
nowadays RunWorkers belonging to RunConfigurations with
a TerminalAspect, so they can directly get the relevant bit
from their RunConfiguration without having it part of
all StandardRunnables.

Change-Id: I1368d5968da5cf672656aebf200ccac8d45335d0
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp

@@ -77,7 +77,6 @@ Runnable QmlProjectRunConfiguration::runnable() const
     Runnable r;
     r.executable = executable();
     r.commandLineArguments = commandLineArguments();
-    r.runMode = ApplicationLauncher::Gui;
     r.environment = extraAspect<QmlProjectEnvironmentAspect>()->environment();
     r.workingDirectory = static_cast<QmlProject *>(project())->targetDirectory(target()).toString();
     return r;