TextEditor BaseHoverHandler::addF1ToToolTip() method has used
a resource from CppEditor (:/cppeditor/images/f1.png), despite
of the inverse official dependecy in PluginSpec file and other
classes.

As it is not used anywhere else - to fix the issue f1.png and
f1.svg are moved from CppEditor to TextEditor.

Change-Id: I14b542837d6337bd08e19ad72cf4a869be08465a
Reviewed-by: Christian Stenger <christian.stenger@nokia.com>
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>