oddgen integration (optional) - Run Test

[PhilippSalvisberg]

Based on issue #11.

Evaluate suite paths and present them in the tree view. Allow to choose one ore more paths and generate the ut.run command. Alternative paths such as "alltests" and "contexts" should be considered. This is the additional value to the pure Package based test execution in the utPLSQL extension.

Implementing the oddgen interface does not have an effect if the oddgen extension is not installed. This means it is not necessary to install oddgen. However, if it is installed, oddgen will automatically detect the implementation and provide the generator in its Generators navigator tree.