automatic adding of license to all python and cpp files

Our copyright but say that it is made for a specific client. See the HKA code as one example. Let's make this default for client projects. i.e., we need support this in the generators in RTW.

Start by inspecting the generators in RTW and compare their output with the HKA code example mentioned in the issue. Determine how client projects identify their copyright notice and which generated Python and C++ files need it; the work is done when the notice is added by default for client-project generation.

Written by the indexing model from the issue text.