TestResult: Devirtualize the class - part 1 of 5

The goal is to make the TestResult a value type without a need
to create these objects on heap.

Introduce a ResultHooks class that will replace all 5 virtual
methods.

Step 1 - implement outputStringHook.

Reorder constructor arguments of TestResult's subclasses so that
the first 2 args are always: id and name.

Change-Id: Iae93e5a348328414f057d1471afad8020b3c1171
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/boost/boosttestoutputreader.h

@@ -8,7 +8,6 @@
 namespace Autotest {
 namespace Internal {
 
-class BoostTestResult;
 enum class LogLevel;
 enum class ReportLevel;