Provide more details about the compiler integration

For the Eclipse plugins, the path of the Titan compiler have to be set, if someone wants to build C/C++ based projects. When the path and the compiler is validated, the compiler -v command is executed. However, in many cases the return value of this command indicates an error, which result in the The version of the compiler used: could not be determined message.

So it would be beneficial, if the users could get more information what could be wrong without leaving the Eclipse IDE. A button could be added that is able show the output of the aforementioned command in a simple pop-up window.