Utils: Make process results accessible through QtcProcess object

The result is fully stored in the object anyway. Using the extra
SynchronousProcessResponse structure only causes copies of
the data and complicates access on the user side in
a lot of cases.

The result bits are now also accessible individually.

There's obvious room for follow-up changes on the topic, e.g.
ShellCommand::runCommand's parameter list could shrink to
just a SynchronousProcess parameter.

Change-Id: I45aa7eb23832340be06905929280c012e1217263
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/vcsbase/vcsbaseplugin.h

@@ -147,13 +147,6 @@ VCSBASE_EXPORT void setSource(Core::IDocument *document, const QString &source);
 // Returns the source of editor contents.
 VCSBASE_EXPORT QString source(Core::IDocument *document);
 
-VCSBASE_EXPORT Utils::SynchronousProcessResponse runVcs(const QString &workingDir,
-                                                        const Utils::CommandLine &cmd,
-                                                        int timeOutS,
-                                                        unsigned flags = 0,
-                                                        QTextCodec *outputCodec = nullptr,
-                                                        const Utils::Environment &env = {});
-
 class VCSBASE_EXPORT VcsBasePluginPrivate : public Core::IVersionControl
 {
     Q_OBJECT