Sergio Baldoví

Use libspectrum_new() to allocate creator's custom data

Fix a discards const qualifier warning in fmfconv

Fix strncpy warning about output truncation in scl2trd

Extend search dirs for DLL dependencies with MSYS2 paths

Thank you Berto. I've tested your branch again and I think is very usable. I would still prefer that integer scaler size was managed internally, increasing or decreasing as needed to best fit on window size. I think SDL2 UI has done some progress in this area. Anyway, I think your patch is better than current code.

Fix drag-and-drop files to GTK3 UI in Windows backend

Use xmlBufferContent to extract XML data

Ignore .exe files in unittests directory