enh(test): add external project gui test support

- rename the gui test core folder to testCore

-change the ITest profile path handling, by geting the full path, and not using "getWorkingDir()". It will be up to the GUI tests to provide the full profile path.

- add the profile modules. The clasicall sightrun looks for the modules situated relatively to the profile path. This allows to load automatically the project modules; This will be done in the ITest too, at the test setup()

-add -B bundlesPath in the cppunit_main. Similarly to classical applications, the -B argument allows specifying additional bundles path. This will be handled in the unit test too.

- change test templates to add external libs path in the PATH variable  and bundles path

- in the eventHandling, verify that the event catched is a testEvent, and do nothing if it is not one. 
 
-install exec_gui_test and copy it in sight-projects build bin dir