QtcProcess: Limit the inclusion of qtcprocess.h

Move the rest of QtcProcess enums to processenums.h.
Move ExitCodeInterpreter into processenums.h.
Remove superfluous Utils:: prefix.

Change-Id: Iaa596f353d33d6930085a621b114cc15a35caa80
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/texteditor/highlightersettings.cpp

@@ -70,7 +70,7 @@ FilePath findFallbackDefinitionsLocation()
             process.setTimeoutS(5);
             process.setCommand({program, {"--prefix"}});
             process.runBlocking();
-            if (process.result() == QtcProcess::FinishedWithSuccess) {
+            if (process.result() == ProcessResult::FinishedWithSuccess) {
                 QString output = process.stdOut();
                 output.remove('\n');
                 const FilePath dir = FilePath::fromString(output);